diff --git a/dlls/hhctrl.ocx/hhctrl.c b/dlls/hhctrl.ocx/hhctrl.c
index 86a31f5ac50..7efca002f9f 100644
--- a/dlls/hhctrl.ocx/hhctrl.c
+++ b/dlls/hhctrl.ocx/hhctrl.c
@@ -41,7 +41,6 @@ WINE_DEFAULT_DEBUG_CHANNEL(htmlhelp);
 HINSTANCE hhctrl_hinstance;
 BOOL hh_process = FALSE;
 
-extern struct list window_list;
 
 BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD fdwReason, LPVOID lpvReserved)
 {
diff --git a/dlls/hhctrl.ocx/hhctrl.h b/dlls/hhctrl.ocx/hhctrl.h
index 206f5ed6757..5318b5f06f5 100644
--- a/dlls/hhctrl.ocx/hhctrl.h
+++ b/dlls/hhctrl.ocx/hhctrl.h
@@ -225,6 +225,7 @@ IStream *GetChmStream(CHMInfo*,LPCWSTR,ChmPath*) DECLSPEC_HIDDEN;
 LPWSTR FindContextAlias(CHMInfo*,DWORD) DECLSPEC_HIDDEN;
 WCHAR *GetDocumentTitle(CHMInfo*,LPCWSTR) DECLSPEC_HIDDEN;
 
+extern struct list window_list DECLSPEC_HIDDEN;
 HHInfo *CreateHelpViewer(HHInfo*,LPCWSTR,HWND) DECLSPEC_HIDDEN;
 void ReleaseHelpViewer(HHInfo*) DECLSPEC_HIDDEN;
 BOOL NavigateToUrl(HHInfo*,LPCWSTR) DECLSPEC_HIDDEN;