diff --git a/data/data.min.json b/data/data.min.json
index 9ea5bca..da1db8c 100644
--- a/data/data.min.json
+++ b/data/data.min.json
@@ -157,7 +157,7 @@
                 "(%3F)?hmb_campaign",
                 "(%3F)?hmb_medium",
                 "(%3F)?hmb_source",
-                "(%3F)?[\\?|&]ref[\\_]?",
+                "(%3F)?[\\?|&]?ref[\\_]?",
                 "(%3F)?gclid",
                 "(%3F)?otm_[a-zA-Z_]*",
                 "(%3F)?cmpid",