diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index 44829d6..a0900bf 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -432,6 +432,7 @@
 		tv->tv_sec--;
 		tv->tv_usec += USEC_PER_SEC;
 	}
+	DCCP_BUG_ON(tv->tv_sec < 0);
 }
 
 #ifdef CONFIG_SYSCTL