diff --git a/dlls/localspl/localspl_private.h b/dlls/localspl/localspl_private.h
index 952c1f6652d..8c49623622d 100644
--- a/dlls/localspl/localspl_private.h
+++ b/dlls/localspl/localspl_private.h
@@ -24,8 +24,8 @@
 #include <windef.h>
 
 /* ## DLL-wide Globals ## */
-extern HINSTANCE LOCALSPL_hInstance;
-void setup_provider(void);
+extern HINSTANCE LOCALSPL_hInstance DECLSPEC_HIDDEN;
+void setup_provider(void) DECLSPEC_HIDDEN;
 
 /* ## Resource-ID ## */
 #define IDS_LOCALPORT       500