diff --git a/cmd/pullrequest-init/disk.go b/cmd/pullrequest-init/disk.go
index 6bef194f25a..f3d00f1575f 100644
--- a/cmd/pullrequest-init/disk.go
+++ b/cmd/pullrequest-init/disk.go
@@ -201,6 +201,8 @@ func FromDisk(path string) (*Resource, error) {
 		return nil, err
 	}
 
+	r.PR.Sha = r.PR.Head.Sha
+
 	return r, nil
 }
 
diff --git a/cmd/pullrequest-init/disk_test.go b/cmd/pullrequest-init/disk_test.go
index a3ceed29c8d..b5b91d53b64 100644
--- a/cmd/pullrequest-init/disk_test.go
+++ b/cmd/pullrequest-init/disk_test.go
@@ -310,6 +310,9 @@ func TestFromDisk(t *testing.T) {
 	if diff := cmp.Diff(rsrc.PR.Head, head); diff != "" {
 		t.Errorf("Get Head: -want +got: %s", diff)
 	}
+	if diff := cmp.Diff(rsrc.PR.Sha, head.Sha); diff != "" {
+		t.Errorf("Get Sha: -want +got: %s", diff)
+	}
 
 	// Check the comments
 	commentMap := map[int]scm.Comment{}