diff --git a/content/hints.js b/content/hints.js
index bed474ea..3b5ed10f 100644
--- a/content/hints.js
+++ b/content/hints.js
@@ -534,7 +534,7 @@ function Hints() //{{{
             case "contains"      : return containsMatcher(hintString);
             case "wordstartswith": return wordStartsWithMatcher(hintString, /*allowWordOverleaping=*/ true);
             case "firstletters"  : return wordStartsWithMatcher(hintString, /*allowWordOverleaping=*/ false);
-            case "custom"        : return plugins.customHintMatcher(hintString);
+            case "custom"        : return liberator.plugins.customHintMatcher(hintString);
             default              : liberator.echoerr("Invalid hintmatching type: " + hintMatching);
         }
         return null;