diff --git a/linear.cabal b/linear.cabal
index 23720af..5ee5025 100644
--- a/linear.cabal
+++ b/linear.cabal
@@ -126,7 +126,7 @@ test-suite doctests
   hs-source-dirs:    tests
   default-language:  Haskell2010
 
-  build-depends: base, simple-reflect >= 0.3.1
+  build-depends: base < 5, simple-reflect >= 0.3.1
 
 test-suite test
   type:           exitcode-stdio-1.0