diff --git a/javascript/manga/src/all/mangadex.js b/javascript/manga/src/all/mangadex.js
index 18272ff7..5880835c 100644
--- a/javascript/manga/src/all/mangadex.js
+++ b/javascript/manga/src/all/mangadex.js
@@ -98,7 +98,7 @@ class DefaultExtension extends MProvider {
             if (filter.type === "HasAvailableChaptersFilter") {
                 if (filter.state) {
                     url += `${this.ll(url)}hasAvailableChapters=true`;
-                    url += `${this.ll(url)}availableTranslatedLanguage[]=${source.lang}`;
+                    url += `${this.ll(url)}availableTranslatedLanguage[]=${this.source.lang}`;
                 }
             } else if (filter.type === "OriginalLanguageList") {
                 const langs = filter.state.filter(e => e.state);