diff --git a/vector/src/Data/Vector/Strict/Mutable.hs b/vector/src/Data/Vector/Strict/Mutable.hs
index bdccf4be..38662eae 100644
--- a/vector/src/Data/Vector/Strict/Mutable.hs
+++ b/vector/src/Data/Vector/Strict/Mutable.hs
@@ -755,4 +755,4 @@ toMutableArray :: PrimMonad m => MVector (PrimState m) a -> m (MutableArray (Pri
 toMutableArray (MVector v) = MV.toMutableArray v
 
 -- $setup
--- >>> import Prelude (Integer)
+-- >>> import Prelude (Integer,Num(..))