diff --git a/src/util/object_serializer.h b/src/util/object_serializer.h
index 20b6ee22db..3332422c9a 100644
--- a/src/util/object_serializer.h
+++ b/src/util/object_serializer.h
@@ -50,7 +50,7 @@ public:
     T read_core(F && f) {
         deserializer & d = get_owner();
         char c = d.read_char();
-        if (c > 0) {
+        if (c != 0) {
             T r = f(c-1);
             m_table.push_back(r);
             return r;