--- a/wide-word.cabal
+++ b/wide-word.cabal
@@ -41,6 +41,7 @@ library
   build-depends:       base                          >= 4.9         && < 4.17
                      , deepseq                       >= 1.3         && < 1.5
                      , primitive                     >= 0.6.4.0     && < 0.8
+		     , ghc-prim                      < 0.8
 
 test-suite test
   default-language:   Haskell2010
