diff --git a/include/mgl2/abstract.h b/include/mgl2/abstract.h
index c8c53b8..245333b 100644
--- a/include/mgl2/abstract.h
+++ b/include/mgl2/abstract.h
@@ -235,7 +235,11 @@ struct MGL_EXPORT mglNum
 };
 //-----------------------------------------------------------------------------
 /// List of user-defined data arrays
+#ifndef MGL_WIDGETS_DLL
 MGL_EXPORT extern std::vector<mglDataA*> mglDataList;
+#else
+__declspec(dllimport) extern std::vector<mglDataA*> mglDataList;
+#endif
 //-----------------------------------------------------------------------------
 /// Abstract class for data array
 class MGL_EXPORT mglDataA
diff --git a/widgets/CMakeLists.txt b/widgets/CMakeLists.txt
index a9e1269..4c1d0d4 100644
--- a/widgets/CMakeLists.txt
+++ b/widgets/CMakeLists.txt
@@ -2,6 +2,7 @@ include(GenerateExportHeader)
 
 if(MSVC)
 	add_definitions(-DMGL_LIB_MSVC)
+	add_definitions(-DMGL_WIDGETS_DLL)
 endif(MSVC)
 
 if(MGL_HAVE_FLTK)