1 files changed, 1 insertions, 1 deletions

diff --git a/src/Data/Wrapper/PSQ.hs b/src/Data/Wrapper/PSQ.hs
index 87648e84..58a6f624 100644
--- a/src/Data/Wrapper/PSQ.hs
+++ b/src/Data/Wrapper/PSQ.hs
@@ -62,7 +62,7 @@ insertWith :: (PSQKey k, Ord p) => (p -> p -> p) -> k -> p -> PSQ k p -> PSQ k p
 insertWith f k p0 q = snd $ Q.alter f' k q
  where
     f' (Just (p,())) = ((),Just (f p0 p, ()))
-    f' Nothing      = ((),Nothing)
+    f' Nothing       = ((),Just (p0,()))
 {-# INLINE insertWith #-}
 
 singleton :: (PSQKey k, Ord p) => k -> p -> PSQ k p