diff --git a/src/wayland-client.c b/src/wayland-client.c
index d0913c5..fe14a6b 100644
--- a/src/wayland-client.c
+++ b/src/wayland-client.c
@@ -1592,7 +1592,7 @@ queue_event(struct wl_display *display, int len)
 		if (debug_client) {
 			clock_gettime(CLOCK_REALTIME, &tp);
 			time = (tp.tv_sec * 1000000L) + (tp.tv_nsec / 1000);
-			fprintf(stderr, "%s[%7u.%03u] %sdiscarded %s[%s]%s#%d%s.[event %d]%s"
+			fprintf(stderr, "%s[%7u.%03u] %sdiscarded %s[%s]%s#%u%s.[event %d]%s"
 				"(%d fd, %d byte)\n",
 				debug_color ? WL_DEBUG_COLOR_GREEN : "",
 				time / 1000, time % 1000,