diff --git a/pmap.go b/pmap.go
index 4351914..e318f45 100644
--- a/pmap.go
+++ b/pmap.go
@@ -72,7 +72,7 @@ func (p pmap) Get(k Key) (Value, bool) {
 
 func (p pmap) Set(k Key, v Value) Map {
 	h := p.hash(k)
-	root, added := insert(p.root, h, k, v, hash)
+	root, added := insert(p.root, h, k, v, p.hash)
 	p.root = root
 	if added {
 		p.len++