diff --git a/src/msw/gsockmsw.cpp b/src/msw/gsockmsw.cpp
index c9e25fd2f1..937b39039b 100644
--- a/src/msw/gsockmsw.cpp
+++ b/src/msw/gsockmsw.cpp
@@ -58,7 +58,7 @@
 #include "wx/msw/gsockmsw.h"
 #include "wx/gsocket.h"
 
-extern "C" HINSTANCE wxGetInstance(void);
+extern "C" WXDLLIMPEXP_BASE HINSTANCE wxGetInstance(void);
 #define INSTANCE wxGetInstance()
 
 #else