diff --git a/pmap.go b/pmap.go
index 7510237..109c893 100644
--- a/pmap.go
+++ b/pmap.go
@@ -82,7 +82,7 @@ func (m *node) getNode(shift, hash uint32, key Key) interface{} {
 	return m.child[i]
 }
 
-func (m *collision) getNode(hash uint32, key Key) interface{} {
+func (m collision) getNode(hash uint32, key Key) interface{} {
 	if hash != m.hash {
 		return nil
 	}
@@ -109,7 +109,7 @@ func lookup(root interface{}, shift, hash uint32, key Key, zero Key) (Value, boo
 		case *node:
 			cur = n.getNode(shift, hash, key)
 			shift += nodeShift
-		case *collision:
+		case collision:
 			cur = n.getNode(hash, key)
 		default:
 			panic("pmap: unhandled case in lookup")
@@ -148,7 +148,7 @@ func insert(n interface{}, shift, hash uint32, key Key, val Value, hashFn HashFu
 			} else if h := hashFn(n.k); h == hash {
 				// collision
 				added = true
-				return &collision{hash, []leaf{{key, val}, n}}
+				return collision{hash, []leaf{{key, val}, n}}
 			} else {
 				if h>>shift == hash>>shift {
 					panic("pmap: infinite loop in insert")
@@ -172,7 +172,7 @@ func insert(n interface{}, shift, hash uint32, key Key, val Value, hashFn HashFu
 			x.child[idx] = c
 			x.bitmap |= 1 << idx
 			return x
-		case *collision:
+		case collision:
 			if n.hash != hash {
 				// not a collision, so we must still have some hash bits left
 				// split the trie
@@ -187,12 +187,12 @@ func insert(n interface{}, shift, hash uint32, key Key, val Value, hashFn HashFu
 					l = append(l, n.leaf[:i]...)
 					l = append(l, n.leaf[i+1:]...)
 					added = false
-					return &collision{hash, l}
+					return collision{hash, l}
 				}
 			}
 			// new collision
 			added = true
-			return &collision{hash, append([]leaf{{key, val}}, n.leaf...)}
+			return collision{hash, append([]leaf{{key, val}}, n.leaf...)}
 		default:
 			panic("pmap: unhandled case in insert")
 		}
@@ -237,7 +237,8 @@ func (p pmap) stats() stats {
 					visit(n.child[i], h+1)
 				}
 			}
-		case *collision:
+		case collision:
+			s.count++
 			s.collisionCount++
 			s.collidedKeys += len(n.leaf)
 		default: