diff --git a/git-annex.cabal b/git-annex.cabal
index 48b2d6793a..545fab3f7c 100644
--- a/git-annex.cabal
+++ b/git-annex.cabal
@@ -367,6 +367,7 @@ Executable git-annex
   Extensions: PackageImports
   -- Some things don't work with the non-threaded RTS.
   GHC-Options: -threaded
+  Other-Extensions: TemplateHaskell
 
   -- Fully optimize for production.
   if flag(Production)