diff --git a/src/common/sysopt.cpp b/src/common/sysopt.cpp
index c8d4539f37..39849e7fa9 100644
--- a/src/common/sysopt.cpp
+++ b/src/common/sysopt.cpp
@@ -46,7 +46,7 @@
 // singleton class so it can't be done in the dtor)
 class wxSystemOptionsModule : public wxModule
 {
-    friend class wxSystemOptions;
+    friend class WXDLLEXPORT wxSystemOptions;
 public:
     virtual bool OnInit();
     virtual void OnExit();