diff --git a/src/js/html-filtering.js b/src/js/html-filtering.js
index 58a23b14e..d1118ba46 100644
--- a/src/js/html-filtering.js
+++ b/src/js/html-filtering.js
@@ -356,7 +356,7 @@
         );
         if ( details.entity !== '' ) {
             filterDB.retrieve(
-                `${hostname.slice(0, -details.domain)}${details.entity}`,
+                `${hostname.slice(0, -details.domain.length)}${details.entity}`,
                 [ plains, exceptions, procedurals, exceptions ]
             );
         }
diff --git a/src/js/scriptlet-filtering.js b/src/js/scriptlet-filtering.js
index 7c2b48903..7477960e4 100644
--- a/src/js/scriptlet-filtering.js
+++ b/src/js/scriptlet-filtering.js
@@ -369,7 +369,7 @@
         );
         if ( request.entity !== '' ) {
             scriptletDB.retrieve(
-                `${hostname.slice(0, -request.domain)}${request.entity}`,
+                `${hostname.slice(0, -request.domain.length)}${request.entity}`,
                 [ scriptlets, exceptions ]
             );
         }