diff --git a/dependent-sum.cabal b/dependent-sum.cabal
--- a/dependent-sum.cabal
+++ b/dependent-sum.cabal
@@ -1,5 +1,5 @@
 name:                   dependent-sum
-version:                0.3.2.0
+version:                0.3.2.1
 stability:              provisional
 
 cabal-version:          >= 1.6
diff --git a/src/Data/Some.hs b/src/Data/Some.hs
--- a/src/Data/Some.hs
+++ b/src/Data/Some.hs
@@ -2,6 +2,9 @@
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ImpredicativeTypes #-}
 {-# LANGUAGE CPP #-}
+#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 702
+{-# LANGUAGE Safe #-}
+#endif
 #if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 708
 {-# LANGUAGE PolyKinds #-}
 #endif