diff --git a/server/core/resultset.cc b/server/core/resultset.cc
index b3593ee50..667b86fe4 100644
--- a/server/core/resultset.cc
+++ b/server/core/resultset.cc
@@ -245,4 +245,6 @@ void ResultSet::write_as_json(DCB* dcb)
     char* js = json_dumps(arr, JSON_INDENT(4));
     dcb_printf(dcb, "%s", js);
     MXS_FREE(js);
+
+    json_decref(arr);
 }