diff --git a/mozilla/widget/src/windows/nsWindow.cpp b/mozilla/widget/src/windows/nsWindow.cpp
index 6c293d93cac..bd19686d43b 100644
--- a/mozilla/widget/src/windows/nsWindow.cpp
+++ b/mozilla/widget/src/windows/nsWindow.cpp
@@ -1696,7 +1696,7 @@ nsWindow* nsWindow::GetParent(PRBool aStopOnFirstTopLevel)
 #ifndef WINCE
 bool gWindowsVisible;
 
-BOOL CALLBACK gEnumWindowsProc(HWND hwnd, LPARAM lParam)
+static BOOL CALLBACK gEnumWindowsProc(HWND hwnd, LPARAM lParam)
 {
   DWORD pid;
   ::GetWindowThreadProcessId(hwnd, &pid);