diff --git a/src/Data/PQueue/Prio/Max.hs b/src/Data/PQueue/Prio/Max.hs
index 47b85b9..1bc39d6 100644
--- a/src/Data/PQueue/Prio/Max.hs
+++ b/src/Data/PQueue/Prio/Max.hs
@@ -105,6 +105,7 @@ module Data.PQueue.Prio.Max (
   foldrWithKeyU,
   foldMapWithKeyU,
   foldlU,
+  foldlU',
   foldlWithKeyU,
   foldlWithKeyU',
   traverseU,