diff --git a/build/wxExtend.props b/build/wxExtend.props
index 24d03f5..d87c385 100644
--- a/build/wxExtend.props
+++ b/build/wxExtend.props
@@ -8,9 +8,6 @@
     <OutDir>..\..\..\output\$(Platform).$(Configuration)\</OutDir>
   </PropertyGroup>
   <ItemDefinitionGroup>
-    <ClCompile>
-      <PreprocessorDefinitions>WXEXTEND;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-    </ClCompile>
     <POCompile>
       <OutputFile>$(OutDir)..\locale\%(Filename)\$(ProjectName)$(wxExtendVersion).mo</OutputFile>
     </POCompile>
diff --git a/build/wxExtendDll.props b/build/wxExtendDll.props
index 9a6fcf7..7aff24d 100644
--- a/build/wxExtendDll.props
+++ b/build/wxExtendDll.props
@@ -5,6 +5,10 @@
   </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup />
-  <ItemDefinitionGroup />
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <PreprocessorDefinitions>WXEXTEND_DLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemGroup />
 </Project>
\ No newline at end of file
diff --git a/include/wxex/common.h b/include/wxex/common.h
index 3a60bed..af7458c 100644
--- a/include/wxex/common.h
+++ b/include/wxex/common.h
@@ -48,14 +48,14 @@
 ///
 /// Public function calling convention
 ///
-#ifdef WXEXTEND
-#ifdef _WINDLL
-#define WXEXTEND_API    __declspec(dllexport)
+#ifndef WXEXTEND_API
+#if defined(WXEXTEND_DLL)
+#define WXEXTEND_API      __declspec(dllexport)
+#elif defined(WXEXTEND_DLLIMP)
+#define WXEXTEND_API      __declspec(dllimport)
 #else
 #define WXEXTEND_API
 #endif
-#else
-#define WXEXTEND_API    __declspec(dllimport)
 #endif