diff --git a/lib/Data/Permute/MPermute.hs b/lib/Data/Permute/MPermute.hs
--- a/lib/Data/Permute/MPermute.hs
+++ b/lib/Data/Permute/MPermute.hs
@@ -78,7 +78,7 @@
 
 import Control.Monad
 import Control.Monad.ST
-#if __GLASGOW_HASKELL__ > 762
+#if __GLASGOW_HASKELL__ >= 78
 import Control.Monad.ST.Unsafe
 #endif
 import Data.Function( on )
diff --git a/permutation.cabal b/permutation.cabal
--- a/permutation.cabal
+++ b/permutation.cabal
@@ -1,5 +1,5 @@
 name:            permutation
-version:         0.5.0.2
+version:         0.5.0.3
 homepage:        https://github.com/spacekitteh/permutation
 synopsis:        A library for permutations and combinations.
 description: