diff --git a/spindle/models/setup_steps.go b/spindle/models/setup_steps.go
--- a/spindle/models/setup_steps.go
+++ b/spindle/models/setup_steps.go
@@ -26,7 +26,7 @@
 	var ref string
 	switch tr.Kind {
 	case "push":
-		ref = tr.Push.Ref
+		ref = tr.Push.NewSha
 	case "pull_request":
 		ref = tr.PullRequest.TargetBranch