diff --git a/src/vmime/fileAttachment.hpp b/src/vmime/fileAttachment.hpp
index 1e7a808a..3c6ca398 100644
--- a/src/vmime/fileAttachment.hpp
+++ b/src/vmime/fileAttachment.hpp
@@ -58,7 +58,7 @@ public:
 
 	/** Stores information about a file attachment.
 	  */
-	class fileInfo
+	class VMIME_EXPORT fileInfo
 	{
 	public:
 
diff --git a/src/vmime/htmlTextPart.hpp b/src/vmime/htmlTextPart.hpp
index 4c1a8632..a7fe6aab 100644
--- a/src/vmime/htmlTextPart.hpp
+++ b/src/vmime/htmlTextPart.hpp
@@ -59,7 +59,7 @@ public:
 
 	/** Embedded object (eg: image for <IMG> tag).
 	  */
-	class embeddedObject : public object
+	class VMIME_EXPORT embeddedObject : public object
 	{
 	public:
 
diff --git a/src/vmime/net/serviceInfos.hpp b/src/vmime/net/serviceInfos.hpp
index 6e3209ca..ec4ca7d6 100644
--- a/src/vmime/net/serviceInfos.hpp
+++ b/src/vmime/net/serviceInfos.hpp
@@ -65,7 +65,7 @@ public:
 
 	/** A service property.
 	  */
-	class property
+	class VMIME_EXPORT property
 	{
 	public: