diff --git a/Source/diablo.cpp b/Source/diablo.cpp
index 1a9323c6a..5e258dd40 100644
--- a/Source/diablo.cpp
+++ b/Source/diablo.cpp
@@ -484,6 +484,7 @@ LRESULT DisableInputWndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 	case WM_CHAR:
 	case WM_SYSKEYDOWN:
 	case WM_SYSCOMMAND:
+		return;
 	case WM_MOUSEMOVE:
 		GetMousePos(lParam);
 		return 0;