diff --git a/lib/GHCup/Utils/Tar/Types.hs b/lib/GHCup/Utils/Tar/Types.hs
index 4dcddfc..72fe645 100644
--- a/lib/GHCup/Utils/Tar/Types.hs
+++ b/lib/GHCup/Utils/Tar/Types.hs
@@ -1,5 +1,7 @@
 {-# LANGUAGE CPP               #-}
+#if defined(TAR)
 {-# LANGUAGE DeriveGeneric     #-}
+#endif
 
 module GHCup.Utils.Tar.Types
   ( ArchiveResult(..)