diff --git a/arangod/RestServer/ArangoServer.h b/arangod/RestServer/ArangoServer.h
index 9168383690..fdf984547a 100644
--- a/arangod/RestServer/ArangoServer.h
+++ b/arangod/RestServer/ArangoServer.h
@@ -434,7 +434,7 @@ namespace triagens {
 /// @endDocuBlock
 ////////////////////////////////////////////////////////////////////////////////
 
-        size_t _queryCacheMaxResults;
+        uint64_t _queryCacheMaxResults;
 
 ////////////////////////////////////////////////////////////////////////////////
 /// @startDocuBlock databaseMaximalJournalSize