diff --git a/panda/src/putil/updateSeq.I b/panda/src/putil/updateSeq.I
index 6a20b2fb33..0c06b3abf7 100644
--- a/panda/src/putil/updateSeq.I
+++ b/panda/src/putil/updateSeq.I
@@ -240,7 +240,7 @@ output(ostream &out) const {
     break;
 
   default:
-    out << _seq;
+    out << (long unsigned int)_seq;
   }
 }