diff --git a/src/net/tls/gnutls/TLSSocket_GnuTLS.cpp b/src/net/tls/gnutls/TLSSocket_GnuTLS.cpp
index 4c789381..0a24b720 100644
--- a/src/net/tls/gnutls/TLSSocket_GnuTLS.cpp
+++ b/src/net/tls/gnutls/TLSSocket_GnuTLS.cpp
@@ -206,7 +206,7 @@ TLSSocket::size_type TLSSocket_GnuTLS::sendRawNonBlocking(const char* buffer, co
 			return 0;
 		}
 
-		TLSSession_GnuTLS::throwTLSException("gnutls_record_send", ret);
+		TLSSession_GnuTLS::throwTLSException("gnutls_record_send", static_cast <int>(ret));
 	}
 
 	return static_cast <size_type>(ret);
diff --git a/src/parsingContext.cpp b/src/parsingContext.cpp
index b440ef1e..527f4705 100644
--- a/src/parsingContext.cpp
+++ b/src/parsingContext.cpp
@@ -34,7 +34,7 @@ parsingContext::parsingContext()
 
 
 parsingContext::parsingContext(const parsingContext& ctx)
-	: context()
+	: context(ctx)
 {
 }
 
diff --git a/src/platforms/posix/posixHandler.cpp b/src/platforms/posix/posixHandler.cpp
index f06c865f..73005d7e 100644
--- a/src/platforms/posix/posixHandler.cpp
+++ b/src/platforms/posix/posixHandler.cpp
@@ -123,9 +123,9 @@ posixHandler::~posixHandler()
 }
 
 
-unsigned int posixHandler::getUnixTime() const
+unsigned long posixHandler::getUnixTime() const
 {
-	return ::time(NULL);
+	return static_cast <unsigned long>(::time(NULL));
 }
 
 
@@ -156,7 +156,7 @@ const vmime::datetime posixHandler::getCurrentLocalTime() const
 	gmt.tm_isdst = -1;
 
 	// Calculate the difference (in seconds)
-	const int diff = ::mktime(&local) - ::mktime(&gmt);
+	const long diff = ::mktime(&local) - ::mktime(&gmt);
 
 	// Return the date
 	return vmime::datetime(local.tm_year + 1900, local.tm_mon + 1, local.tm_mday,
diff --git a/src/platforms/windows/windowsHandler.cpp b/src/platforms/windows/windowsHandler.cpp
index 99b52cdf..f306710f 100644
--- a/src/platforms/windows/windowsHandler.cpp
+++ b/src/platforms/windows/windowsHandler.cpp
@@ -71,9 +71,9 @@ windowsHandler::~windowsHandler()
 }
 
 
-unsigned int windowsHandler::getUnixTime() const
+unsigned long windowsHandler::getUnixTime() const
 {
-	return static_cast <unsigned int>(::time(NULL));
+	return static_cast <unsigned long>(::time(NULL));
 }
 
 
diff --git a/src/security/cert/gnutls/X509Certificate_GnuTLS.cpp b/src/security/cert/gnutls/X509Certificate_GnuTLS.cpp
index fd1343dd..96137844 100644
--- a/src/security/cert/gnutls/X509Certificate_GnuTLS.cpp
+++ b/src/security/cert/gnutls/X509Certificate_GnuTLS.cpp
@@ -96,7 +96,7 @@ ref <X509Certificate> X509Certificate::import(utility::inputStream& is)
 
 	while (!is.eof())
 	{
-		const int len = is.read(chunk, sizeof(chunk));
+		const utility::stream::size_type len = is.read(chunk, sizeof(chunk));
 		bytes.insert(bytes.end(), chunk, chunk + len);
 	}
 
@@ -106,11 +106,11 @@ ref <X509Certificate> X509Certificate::import(utility::inputStream& is)
 
 // static
 ref <X509Certificate> X509Certificate::import
-	(const byte_t* data, const unsigned int length)
+	(const byte_t* data, const size_t length)
 {
 	gnutls_datum buffer;
 	buffer.data = const_cast <byte_t*>(data);
-	buffer.size = length;
+	buffer.size = static_cast <unsigned int>(length);
 
 	// Try DER format
 	ref <X509Certificate_GnuTLS> derCert = vmime::create <X509Certificate_GnuTLS>();
diff --git a/src/security/cert/openssl/X509Certificate_OpenSSL.cpp b/src/security/cert/openssl/X509Certificate_OpenSSL.cpp
index ff2062c1..61be0d6d 100755
--- a/src/security/cert/openssl/X509Certificate_OpenSSL.cpp
+++ b/src/security/cert/openssl/X509Certificate_OpenSSL.cpp
@@ -185,7 +185,7 @@ ref <X509Certificate> X509Certificate::import(utility::inputStream& is)
 
 // static
 ref <X509Certificate> X509Certificate::import
-	(const byte_t* data, const unsigned int length)
+	(const byte_t* data, const size_t length)
 {
 	ref <X509Certificate_OpenSSL> cert = vmime::create <X509Certificate_OpenSSL>();
 
diff --git a/src/utility/random.cpp b/src/utility/random.cpp
index 5dda639d..6e96ed4e 100644
--- a/src/utility/random.cpp
+++ b/src/utility/random.cpp
@@ -46,7 +46,7 @@ unsigned int random::getNext()
 
 unsigned int random::getTime()
 {
-	return (platform::getHandler()->getUnixTime());
+	return static_cast <unsigned int>((platform::getHandler()->getUnixTime()));
 }
 
 
diff --git a/tests/parser/charsetFilteredOutputStreamTest.cpp b/tests/parser/charsetFilteredOutputStreamTest.cpp
index fdfed2c6..08eeb63c 100644
--- a/tests/parser/charsetFilteredOutputStreamTest.cpp
+++ b/tests/parser/charsetFilteredOutputStreamTest.cpp
@@ -101,10 +101,10 @@ VMIME_TEST_SUITE_BEGIN(charsetFilteredOutputStreamTest)
 			std::ostringstream testName;
 			testName << i << ": " << entry.fromCharset << " -> " << entry.toCharset;
 
-			const unsigned int inLength = (entry.fromLength == 0 ? strlen(entry.fromBytes) : entry.fromLength);
+			const unsigned long inLength = (entry.fromLength == 0 ? strlen(entry.fromBytes) : entry.fromLength);
 			vmime::string in(entry.fromBytes, entry.fromBytes + inLength);
 
-			const unsigned int outLength = (entry.toLength == 0 ? strlen(entry.toBytes) : entry.toLength);
+			const unsigned long outLength = (entry.toLength == 0 ? strlen(entry.toBytes) : entry.toLength);
 			vmime::string expectedOut(entry.toBytes, entry.toBytes + outLength);
 
 			vmime::string actualOut;
@@ -136,10 +136,10 @@ VMIME_TEST_SUITE_BEGIN(charsetFilteredOutputStreamTest)
 			std::ostringstream testName;
 			testName << i << ": " << entry.fromCharset << " -> " << entry.toCharset;
 
-			const unsigned int inLength = (entry.fromLength == 0 ? strlen(entry.fromBytes) : entry.fromLength);
+			const unsigned long inLength = (entry.fromLength == 0 ? strlen(entry.fromBytes) : entry.fromLength);
 			vmime::string in(entry.fromBytes, entry.fromBytes + inLength);
 
-			const unsigned int outLength = (entry.toLength == 0 ? strlen(entry.toBytes) : entry.toLength);
+			const unsigned long outLength = (entry.toLength == 0 ? strlen(entry.toBytes) : entry.toLength);
 			vmime::string expectedOut(entry.toBytes, entry.toBytes + outLength);
 
 			vmime::string actualOut;
@@ -174,10 +174,10 @@ VMIME_TEST_SUITE_BEGIN(charsetFilteredOutputStreamTest)
 			std::ostringstream testName;
 			testName << i << ": " << entry.fromCharset << " -> " << entry.toCharset;
 
-			const unsigned int inLength = (entry.fromLength == 0 ? strlen(entry.fromBytes) : entry.fromLength);
+			const unsigned long inLength = (entry.fromLength == 0 ? strlen(entry.fromBytes) : entry.fromLength);
 			vmime::string in(entry.fromBytes, entry.fromBytes + inLength);
 
-			const unsigned int outLength = (entry.toLength == 0 ? strlen(entry.toBytes) : entry.toLength);
+			const unsigned long outLength = (entry.toLength == 0 ? strlen(entry.toBytes) : entry.toLength);
 			vmime::string expectedOut(entry.toBytes, entry.toBytes + outLength);
 
 			vmime::string actualOut;
diff --git a/tests/parser/charsetTest.cpp b/tests/parser/charsetTest.cpp
index 8725c530..2aab7550 100644
--- a/tests/parser/charsetTest.cpp
+++ b/tests/parser/charsetTest.cpp
@@ -51,10 +51,10 @@ VMIME_TEST_SUITE_BEGIN(charsetTest)
 			std::ostringstream testName;
 			testName << i << ": " << entry.fromCharset << " -> " << entry.toCharset;
 
-			const unsigned int inLength = (entry.fromLength == 0 ? strlen(entry.fromBytes) : entry.fromLength);
+			const unsigned long inLength = (entry.fromLength == 0 ? strlen(entry.fromBytes) : entry.fromLength);
 			vmime::string in(entry.fromBytes, entry.fromBytes + inLength);
 
-			const unsigned int outLength = (entry.toLength == 0 ? strlen(entry.toBytes) : entry.toLength);
+			const unsigned long outLength = (entry.toLength == 0 ? strlen(entry.toBytes) : entry.toLength);
 			vmime::string expectedOut(entry.toBytes, entry.toBytes + outLength);
 
 			vmime::string actualOut;
@@ -75,10 +75,10 @@ VMIME_TEST_SUITE_BEGIN(charsetTest)
 			std::ostringstream testName;
 			testName << i << ": " << entry.fromCharset << " -> " << entry.toCharset;
 
-			const unsigned int inLength = (entry.fromLength == 0 ? strlen(entry.fromBytes) : entry.fromLength);
+			const unsigned long inLength = (entry.fromLength == 0 ? strlen(entry.fromBytes) : entry.fromLength);
 			vmime::string in(entry.fromBytes, entry.fromBytes + inLength);
 
-			const unsigned int outLength = (entry.toLength == 0 ? strlen(entry.toBytes) : entry.toLength);
+			const unsigned long outLength = (entry.toLength == 0 ? strlen(entry.toBytes) : entry.toLength);
 			vmime::string expectedOut(entry.toBytes, entry.toBytes + outLength);
 
 			vmime::string actualOut;
diff --git a/tests/testUtils.cpp b/tests/testUtils.cpp
index d008ed94..cb6df133 100644
--- a/tests/testUtils.cpp
+++ b/tests/testUtils.cpp
@@ -276,15 +276,15 @@ const vmime::string toHex(const vmime::string str)
 
 	vmime::string res = "\n";
 
-	for (unsigned int i = 0 ; i < str.length() ; i += 16)
+	for (size_t i = 0 ; i < str.length() ; i += 16)
 	{
-		unsigned int r = std::min
+		size_t r = std::min
 			(static_cast <size_t>(16), str.length() - i);
 
 		vmime::string hex;
 		vmime::string chr;
 
-		for (unsigned int j = 0 ; j < r ; ++j)
+		for (size_t j = 0 ; j < r ; ++j)
 		{
 			const unsigned char c = str[i + j];
 
@@ -298,7 +298,7 @@ const vmime::string toHex(const vmime::string str)
 				chr += '.';
 		}
 
-		for (unsigned int j = r ; j < 16 ; ++j)
+		for (size_t j = r ; j < 16 ; ++j)
 			hex += "   ";
 
 		res += hex + "  " + chr + "\n";
diff --git a/vmime/net/imap/IMAPParser.hpp b/vmime/net/imap/IMAPParser.hpp
index 2e6f7cc8..c8300122 100644
--- a/vmime/net/imap/IMAPParser.hpp
+++ b/vmime/net/imap/IMAPParser.hpp
@@ -5056,7 +5056,6 @@ private:
 
 
 	string m_buffer;
-	int m_pos;
 
 	string m_lastLine;
 
diff --git a/vmime/platform.hpp b/vmime/platform.hpp
index cb86dfd8..1d6c059e 100644
--- a/vmime/platform.hpp
+++ b/vmime/platform.hpp
@@ -69,7 +69,7 @@ public:
 		  *
 		  * @return UNIX Epoch time
 		  */
-		virtual unsigned int getUnixTime() const = 0;
+		virtual unsigned long getUnixTime() const = 0;
 
 		/** Return the current date and time, in the local time zone.
 		  *
diff --git a/vmime/platforms/posix/posixHandler.hpp b/vmime/platforms/posix/posixHandler.hpp
index 4bf3a220..e7bdea4a 100644
--- a/vmime/platforms/posix/posixHandler.hpp
+++ b/vmime/platforms/posix/posixHandler.hpp
@@ -55,7 +55,7 @@ public:
 	posixHandler();
 	~posixHandler();
 
-	unsigned int getUnixTime() const;
+	unsigned long getUnixTime() const;
 
 	const vmime::datetime getCurrentLocalTime() const;
 
diff --git a/vmime/platforms/windows/windowsHandler.hpp b/vmime/platforms/windows/windowsHandler.hpp
index 5e95d65b..2ca8b7dc 100644
--- a/vmime/platforms/windows/windowsHandler.hpp
+++ b/vmime/platforms/windows/windowsHandler.hpp
@@ -54,7 +54,7 @@ public:
 	windowsHandler();
 	~windowsHandler();
 
-	unsigned int getUnixTime() const;
+	unsigned long getUnixTime() const;
 
 	const vmime::datetime getCurrentLocalTime() const;
 
diff --git a/vmime/security/cert/X509Certificate.hpp b/vmime/security/cert/X509Certificate.hpp
index 7e45dafb..4b9145f2 100644
--- a/vmime/security/cert/X509Certificate.hpp
+++ b/vmime/security/cert/X509Certificate.hpp
@@ -36,6 +36,7 @@
 #include "vmime/utility/stream.hpp"
 
 #include "vmime/base.hpp"
+#include "vmime/types.hpp"
 #include "vmime/dateTime.hpp"
 
 
@@ -82,7 +83,7 @@ public:
 	  * @return a X.509 certificate, or NULL if the given data does not
 	  * represent a valid certificate
 	  */
-	static ref <X509Certificate> import(const byte_t* data, const unsigned int length);
+	static ref <X509Certificate> import(const byte_t* data, const size_t length);
 
 	/** Exports this X.509 certificate to the specified format.
 	  *
diff --git a/vmime/utility/smartPtr.hpp b/vmime/utility/smartPtr.hpp
index acfdaa88..c7e7c33e 100644
--- a/vmime/utility/smartPtr.hpp
+++ b/vmime/utility/smartPtr.hpp
@@ -128,7 +128,11 @@ class null_ref
 {
 private:
 
+
+#pragma GCC diagnostic ignored "-Wunused-private-field"
 	int foo;
+#pragma GCC diagnostic warning "-Wunused-private-field"
+
 };