diff --git a/src/x.c b/src/x.c
index 5e0ce71c..f0a34d3b 100644
--- a/src/x.c
+++ b/src/x.c
@@ -48,7 +48,7 @@ static con_state *state_for_frame(xcb_window_t window) {
 
     /* TODO: better error handling? */
     ELOG("No state found\n");
-    assert(true);
+    assert(false);
     return NULL;
 }