diff --git a/ma.cabal b/ma.cabal
index e46c676a77404777062ee8a7b03dccc918f8212c..9c45d96e6694fd438b7c1d02be878193f88b520e 100644
--- a/ma.cabal
+++ b/ma.cabal
@@ -166,6 +166,7 @@ test-suite spec
                      , containers
                      , mtl
                      , ma
+  build-tool-depends: hspec-discover:hspec-discover ==2.*
 
 test-suite doctests
   type:                exitcode-stdio-1.0