diff --git a/system/rtc.c b/system/rtc.c
index dc44576686..216d2aee3a 100644
--- a/system/rtc.c
+++ b/system/rtc.c
@@ -62,7 +62,7 @@ static time_t qemu_ref_timedate(QEMUClockType clock)
         }
         break;
     default:
-        assert(0);
+        g_assert_not_reached();
     }
     return value;
 }