diff --git a/distributed-process-tests/distributed-process-tests.cabal b/distributed-process-tests/distributed-process-tests.cabal
index 1321ca2e..a85f3361 100644
--- a/distributed-process-tests/distributed-process-tests.cabal
+++ b/distributed-process-tests/distributed-process-tests.cabal
@@ -44,15 +44,15 @@ library
   hs-source-dirs:    src
   default-language:  Haskell98
   ghc-options:       -Wall -fno-warn-unused-do-bind
-  extensions:        CPP,
-                     ExistentialQuantification,
-                     FlexibleInstances,
-                     DeriveDataTypeable,
-                     DeriveGeneric,
-                     GeneralizedNewtypeDeriving,
-                     RankNTypes,
-                     RecordWildCards,
-                     ScopedTypeVariables
+  default-extensions: CPP,
+                      ExistentialQuantification,
+                      FlexibleInstances,
+                      DeriveDataTypeable,
+                      DeriveGeneric,
+                      GeneralizedNewtypeDeriving,
+                      RankNTypes,
+                      RecordWildCards,
+                      ScopedTypeVariables
   if impl(ghc <= 7.4.2)
     Build-Depends:   ghc-prim == 0.2.0.0
 
@@ -66,7 +66,7 @@ Test-Suite TestCHInMemory
                      network-transport >= 0.4.1.0 && < 0.6,
                      network-transport-inmemory >= 0.5,
                      test-framework >= 0.6 && < 0.9
-  Extensions:        CPP
+  default-extensions: CPP
   default-language:  Haskell98
   ghc-options:       -Wall -threaded -rtsopts -with-rtsopts=-N -fno-warn-unused-do-bind
   HS-Source-Dirs:    tests
@@ -84,7 +84,7 @@ Test-Suite TestCHInTCP
                        test-framework >= 0.6 && < 0.9
   else
     Buildable:       False
-  Extensions:        CPP
+  default-extensions: CPP
   default-language:  Haskell98
   ghc-options:       -Wall -threaded -rtsopts -with-rtsopts=-N -fno-warn-unused-do-bind
   HS-Source-Dirs:    tests
@@ -100,7 +100,7 @@ Test-Suite TestClosure
                      network-transport >= 0.4.1.0 && < 0.6,
                      network-transport-inmemory >= 0.5,
                      test-framework >= 0.6 && < 0.9
-  Extensions:        CPP
+  default-extensions: CPP
   default-language:  Haskell98
   ghc-options:       -Wall -threaded -rtsopts -with-rtsopts=-N -fno-warn-unused-do-bind
   HS-Source-Dirs:    tests
@@ -115,7 +115,7 @@ Test-Suite TestStats
                      network-transport >= 0.4.1.0 && < 0.6,
                      network-transport-inmemory >= 0.5,
                      test-framework >= 0.6 && < 0.9
-  Extensions:        CPP
+  default-extensions: CPP
   default-language:  Haskell98
   ghc-options:       -Wall -threaded -rtsopts -with-rtsopts=-N -fno-warn-unused-do-bind
   HS-Source-Dirs:    tests
@@ -130,7 +130,7 @@ Test-Suite TestMxInMemory
                      network-transport >= 0.4.1.0 && < 0.6,
                      network-transport-inmemory >= 0.5,
                      test-framework >= 0.6 && < 0.9
-  Extensions:        CPP
+  default-extensions: CPP
   default-language:  Haskell98
   ghc-options:       -threaded -rtsopts -with-rtsopts=-N -fno-warn-unused-do-bind
   HS-Source-Dirs:    tests
@@ -145,7 +145,7 @@ Test-Suite TestTracingInMemory
                      network-transport >= 0.4.1.0 && < 0.6,
                      network-transport-inmemory >= 0.5,
                      test-framework >= 0.6 && < 0.9
-  Extensions:        CPP
+  default-extensions: CPP
   default-language:  Haskell98
   ghc-options:       -threaded -rtsopts -with-rtsopts=-N -fno-warn-unused-do-bind
   HS-Source-Dirs:    tests
@@ -160,7 +160,7 @@ Test-Suite TestMxInTCP
                      network-transport >= 0.4.1.0 && < 0.6,
                      network-transport-inmemory >= 0.5,
                      test-framework >= 0.6 && < 0.9
-  Extensions:        CPP
+  default-extensions: CPP
   default-language:  Haskell98
   ghc-options:       -Wall -threaded -rtsopts -with-rtsopts=-N -fno-warn-unused-do-bind
   HS-Source-Dirs:    tests