diff --git a/src/glwin.c b/src/glwin.c
index cdeb8ba9..66883b2a 100644
--- a/src/glwin.c
+++ b/src/glwin.c
@@ -53,7 +53,7 @@
 #endif /* ENABLE_DEBUG */
 
 static struct {
-   char                mode;
+   int                 mode;
 } Conf_glwin;
 
 static struct {