diff --git a/test/input.c b/test/input.c
index 4cd39bb48..8638f1443 100644
--- a/test/input.c
+++ b/test/input.c
@@ -230,7 +230,7 @@ dix_check_grab_values(void)
 static void
 dix_event_to_core(int type)
 {
-    DeviceEvent ev;
+    DeviceEvent ev = {};
     xEvent *core;
     int time;
     int x, y;