diff --git a/src/runtime/chan_test.go b/src/runtime/chan_test.go
index d4752dd344..039a086e9b 100644
--- a/src/runtime/chan_test.go
+++ b/src/runtime/chan_test.go
@@ -719,6 +719,7 @@ func TestSelectStackAdjust(t *testing.T) {
 		if after.NumGC-before.NumGC >= 2 {
 			goto done
 		}
+		runtime.Gosched()
 	}
 	t.Fatal("failed to trigger concurrent GC")
 done: