diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
index 1d9db81299..c03b13b624 100644
--- a/migration/dirtyrate.c
+++ b/migration/dirtyrate.c
@@ -228,7 +228,7 @@ static int time_unit_to_power(TimeUnit time_unit)
     case TIME_UNIT_MILLISECOND:
         return -3;
     default:
-        assert(false); /* unreachable */
+        g_assert_not_reached();
         return 0;
     }
 }