diff --git a/vmime/base.hpp b/vmime/base.hpp
index 6b7588fd..2437514b 100644
--- a/vmime/base.hpp
+++ b/vmime/base.hpp
@@ -257,7 +257,7 @@ namespace vmime
 	/** Inherit from this class to indicate the subclass is not copyable,
 	  * ie. you want to prohibit copy construction and copy assignment.
 	  */
-	class noncopyable
+	class VMIME_EXPORT noncopyable
 	{
 	protected:
 
diff --git a/vmime/net/message.hpp b/vmime/net/message.hpp
index de5e884a..6bf4b492 100644
--- a/vmime/net/message.hpp
+++ b/vmime/net/message.hpp
@@ -177,7 +177,7 @@ public:
 
 	/** The type for an unique message identifier.
 	  */
-	class uid
+	class VMIME_EXPORT uid
 	{
 	public: