diff --git a/vlib/v/tests/anon_fn_test.v b/vlib/v/tests/anon_fn_test.v
index 0773e4cccf..f702464f9a 100644
--- a/vlib/v/tests/anon_fn_test.v
+++ b/vlib/v/tests/anon_fn_test.v
@@ -2,6 +2,7 @@ import sync
 
 fn test_go_anon_fn() {
 	mut wg := sync.new_waitgroup()
+	wg.add(1)    
 	go fn (mut wg sync.WaitGroup) {
 		wg.done()
 	}(mut wg)