diff --git a/dwm.c b/dwm.c
index 5ff6fd4..1249997 100644
--- a/dwm.c
+++ b/dwm.c
@@ -559,6 +559,9 @@ configurenotify(XEvent *e)
 
 	/* TODO: updategeom handling sucks, needs to be simplified */
 	if (ev->window == root) {
+		if (ev->width <= 0 || ev->height <= 0)
+			return;
+
 		dirty = (sw != ev->width || sh != ev->height);
 		sw = ev->width;
 		sh = ev->height;