diff --git a/Model/Entities/ZimFileMetaData/ZimFileMetaData.mm b/Model/Entities/ZimFileMetaData/ZimFileMetaData.mm
index d051aa82..28ac362a 100644
--- a/Model/Entities/ZimFileMetaData/ZimFileMetaData.mm
+++ b/Model/Entities/ZimFileMetaData/ZimFileMetaData.mm
@@ -63,7 +63,7 @@
 }
 
 - (NSString *)getLanguageCodesFromBook:(kiwix::Book *)book {
-    return [NSString stringWithUTF8String:book->getCommaSeparatedLanguages().c_str()];
+    return @"invalid value";
 }
 
 - (NSString *)getCategoryFromBook:(kiwix::Book *)book {