diff --git a/src/process/ntapi_tt_fork_v1.c b/src/process/ntapi_tt_fork_v1.c
index eeee49b..74e0b7e 100644
--- a/src/process/ntapi_tt_fork_v1.c
+++ b/src/process/ntapi_tt_fork_v1.c
@@ -166,15 +166,20 @@ intptr_t __fastcall __ntapi_tt_fork_v1(
 	timeout.quad	= (-1) * 10 * 1000 * __NT_FORK_CHILD_WAIT_MILLISEC;
 	htty_connected  = 0;
 
-	if (at_locked_cas(&__internals->hlock,0,1))
-		return (intptr_t)(-1);
+	while (at_locked_cas(&__internals->hlock,0,1))
+		__ntapi->zw_delay_execution(
+			NT_SYNC_NON_ALERTABLE,
+			&(nt_timeout){{0,0}});
 
-	if (hport_session && *hport_session)
+	if (hport_session && *hport_session) {
 		if (__ntapi_tt_create_inheritable_event(
 				&htty_connected,
 				NT_NOTIFICATION_EVENT,
-				NT_EVENT_NOT_SIGNALED))
+				NT_EVENT_NOT_SIGNALED)) {
+			at_store(&__internals->hlock,0);
 			return (intptr_t)(-1);
+		}
+	}
 
 	pid = __tt_fork_v1();