Index: dll/cpl/openglcfg/general.c
===================================================================
--- dll/cpl/openglcfg/general.c	(revision 74931)
+++ dll/cpl/openglcfg/general.c	(working copy)
@@ -170,7 +170,8 @@
             return TRUE;
 
         case WM_COMMAND:
-            if (LOWORD(wParam) == IDC_RENDERER || IDC_DEBUG_OUTPUT)
+            if ((LOWORD(wParam) == IDC_RENDERER) || 
+                (LOWORD(wParam) == IDC_DEBUG_OUTPUT))
                 PropSheet_Changed(GetParent(hWndDlg), hWndDlg);
             break;