diff --git a/chain/sync_test.go b/chain/sync_test.go
index 78e7cb1b3..4928ce79c 100644
--- a/chain/sync_test.go
+++ b/chain/sync_test.go
@@ -226,7 +226,6 @@ func TestSyncSimple(t *testing.T) {
 }
 
 func TestSyncMining(t *testing.T) {
-	t.SkipNow()
 	H := 50
 	tu := prepSyncTest(t, H)
 
@@ -235,7 +234,7 @@ func TestSyncMining(t *testing.T) {
 
 	require.NoError(t, tu.mn.LinkAll())
 	tu.connect(1, 0)
-	time.Sleep(time.Second * 2)
+	time.Sleep(time.Second * 4)
 
 	tu.checkHeight("client", client, H)