diff --git a/st.c b/st.c
index 040638a..546db41 100644
--- a/st.c
+++ b/st.c
@@ -3786,6 +3786,8 @@ run(void) {
 	/* Waiting for window mapping */
 	while(1) {
 		XNextEvent(xw.dpy, &ev);
+		if(XFilterEvent(&ev, None))
+			continue;
 		if(ev.type == ConfigureNotify) {
 			w = ev.xconfigure.width;
 			h = ev.xconfigure.height;