diff --git a/haddock-api/haddock-api.cabal b/haddock-api/haddock-api.cabal
index daefa84ac7642ea27bebb1cdd17c227a1a991bf0..2db2e992d2eafd15c38f3159ce1beb96c493d8ac 100644
--- a/haddock-api/haddock-api.cabal
+++ b/haddock-api/haddock-api.cabal
@@ -123,4 +123,5 @@ test-suite spec
 
 source-repository head
   type:     git
+  subdir:   haddock-api
   location: https://github.com/haskell/haddock.git