diff --git a/stepmania/src/archutils/Win32/GraphicsWindow.cpp b/stepmania/src/archutils/Win32/GraphicsWindow.cpp
index 1899dd44c1..9fbdf2ae3c 100644
--- a/stepmania/src/archutils/Win32/GraphicsWindow.cpp
+++ b/stepmania/src/archutils/Win32/GraphicsWindow.cpp
@@ -48,7 +48,7 @@ static CString GetNewWindow()
 	return sName;
 }
 
-LRESULT CALLBACK GraphicsWindow::GraphicsWindow_WndProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
+static LRESULT CALLBACK GraphicsWindow_WndProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
 {
 	/* Suppress autorun. */
 	if( msg == g_iQueryCancelAutoPlayMessage )
diff --git a/stepmania/src/archutils/Win32/GraphicsWindow.h b/stepmania/src/archutils/Win32/GraphicsWindow.h
index b4a12edc75..4f41db13cb 100644
--- a/stepmania/src/archutils/Win32/GraphicsWindow.h
+++ b/stepmania/src/archutils/Win32/GraphicsWindow.h
@@ -23,8 +23,6 @@ namespace GraphicsWindow
 
 	void GetDisplayResolutions( DisplayResolutions &out );
 
-	LRESULT CALLBACK GraphicsWindow_WndProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam );
-
 	void GetParams( VideoModeParams &paramsOut );
 	HDC GetHDC();
 	void Update();