diff --git a/src/runtime/pprof/pprof_test.go b/src/runtime/pprof/pprof_test.go
index 287a9b95c4..00608c7354 100644
--- a/src/runtime/pprof/pprof_test.go
+++ b/src/runtime/pprof/pprof_test.go
@@ -511,6 +511,7 @@ func blockCond() {
 }
 
 func TestMutexProfile(t *testing.T) {
+	testenv.SkipFlaky(t, 19139)
 	old := runtime.SetMutexProfileFraction(1)
 	defer runtime.SetMutexProfileFraction(old)
 	if old != 0 {