diff --git a/package.yaml b/package.yaml
index 41e15f7..5b6a7e5 100644
--- a/package.yaml
+++ b/package.yaml
@@ -29,7 +29,8 @@ library:
     cpp-options: -DWINDOWS
 
 tests:
-  typed-process-test:
+  typed-process-test: &typed-process-test
+    build-tools: hspec-discover
     main: Spec.hs
     source-dirs: test
     ghc-options:
@@ -38,14 +39,9 @@ tests:
     - -with-rtsopts=-N
     dependencies:
     - base64-bytestring
-    - hspec
+    - hspec == 2.*
     - temporary
     - typed-process
   typed-process-test-single-threaded:
-    main: Spec.hs
-    source-dirs: test
-    dependencies:
-    - base64-bytestring
-    - hspec
-    - temporary
-    - typed-process
+    <<: *typed-process-test
+    ghc-options: []
diff --git a/src/System/Process/Typed/Internal.hs b/src/System/Process/Typed/Internal.hs
index 13f65d5..0c958bd 100644
--- a/src/System/Process/Typed/Internal.hs
+++ b/src/System/Process/Typed/Internal.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE DataKinds #-}