diff --git a/session_test.go b/session_test.go
index 359b7455e..a835a264b 100644
--- a/session_test.go
+++ b/session_test.go
@@ -213,6 +213,9 @@ func (s *S) TestMaxIdleTimeMS(c *C) {
 }
 
 func (s *S) TestPoolShrink(c *C) {
+	if *fast {
+		c.Skip("-fast")
+	}
 	oldSocket := mgo.GetStats().SocketsAlive
 
 	session, err := mgo.Dial("localhost:40001?minPoolSize=1&maxIdleTimeMS=1000")