diff --git a/scripts/build.mjs b/scripts/build.mjs
index c5799d1..7e7c6f8 100644
--- a/scripts/build.mjs
+++ b/scripts/build.mjs
@@ -178,7 +178,7 @@ function replaceString() {
             `${match[1]}="${config.addonRef}-${match[2]}"`
           );
         } else {
-          localeMessageMiss.add(match[1]);
+          localeMessageMiss.add(match[2]);
         }
       });
       return input;