diff --git a/dlls/imagehlp/access.c b/dlls/imagehlp/access.c
index 009d6f72469..cf19e6c90cd 100644
--- a/dlls/imagehlp/access.c
+++ b/dlls/imagehlp/access.c
@@ -54,7 +54,7 @@ static LOADED_IMAGE IMAGEHLP_EmptyLoadedImage = {
   148,        /* SizeOfImage; */
 };
 
-extern HANDLE IMAGEHLP_hHeap;
+DECLSPEC_HIDDEN extern HANDLE IMAGEHLP_hHeap;
 
 /***********************************************************************
  *		GetImageConfigInformation (IMAGEHLP.@)
diff --git a/dlls/imagehlp/imagehlp_main.c b/dlls/imagehlp/imagehlp_main.c
index 91c76bdb7d4..3ddae7aa5c4 100644
--- a/dlls/imagehlp/imagehlp_main.c
+++ b/dlls/imagehlp/imagehlp_main.c
@@ -26,7 +26,7 @@
 #include "wine/debug.h"
 
 /**********************************************************************/
-HANDLE IMAGEHLP_hHeap = NULL;
+DECLSPEC_HIDDEN HANDLE IMAGEHLP_hHeap = NULL;
 
 /***********************************************************************
  *           DllMain (IMAGEHLP.init)