diff --git a/plugins.cabal b/plugins.cabal
index 00a999a..a10fe74 100644
--- a/plugins.cabal
+++ b/plugins.cabal
@@ -35,4 +35,4 @@ includes:             Linker.h
 extensions:           CPP, ForeignFunctionInterface
 Build-Depends:        base, Cabal, haskell-src
 ghc-options:          -Wall -O -fvia-C -funbox-strict-fields -fno-warn-missing-signatures
-Hs-source-dirs: src
+hs-source-dir: src
diff --git a/plugins.cabal.hsx b/plugins.cabal.hsx
index 62b8825..e7db7a5 100644
--- a/plugins.cabal.hsx
+++ b/plugins.cabal.hsx
@@ -35,4 +35,4 @@ includes:             Linker.h
 extensions:           CPP, ForeignFunctionInterface
 Build-Depends:        base, Cabal, haskell-src-exts
 ghc-options:          -Wall -O -fvia-C -funbox-strict-fields -fno-warn-missing-signatures
-Hs-source-dirs: src
+hs-source-dir: src