diff --git a/config.json b/config.json
index 464b63f..ee728be 100644
--- a/config.json
+++ b/config.json
@@ -110,7 +110,7 @@
         "get-record": "record?pid={curie}&format=ttl",
         "get-records": "records/{name}?format=ttl",
         "get-paginated-records": "records/p/{name}?format=ttl&size=100&page={page_number}",
-        "get-paginated-records-constrained": "records/p/{name}?format=ttl&matching=%{match_string}%&size=100&page={page_number}"
+        "get-paginated-records-constrained": "records/p/{name}?format=ttl&matching=%25{match_string}%25&size=100&page={page_number}"
     },
     "service_fetch_before": {
         "get-record": [],