diff --git a/src/runtime/signal_windows_test.go b/src/runtime/signal_windows_test.go
index b34a122e77..9318ff9c00 100644
--- a/src/runtime/signal_windows_test.go
+++ b/src/runtime/signal_windows_test.go
@@ -24,7 +24,6 @@ func TestVectoredHandlerExceptionInNonGoThread(t *testing.T) {
 	if strings.HasPrefix(testenv.Builder(), "windows-amd64-2012") {
 		testenv.SkipFlaky(t, 49681)
 	}
-	t.Parallel()
 	testenv.MustHaveGoBuild(t)
 	testenv.MustHaveCGO(t)
 	testenv.MustHaveExecPath(t, "gcc")
@@ -86,7 +85,6 @@ func TestVectoredHandlerDontCrashOnLibrary(t *testing.T) {
 		// See go.dev/issues/43800.
 		t.Skip("this test can't run on windows/arm")
 	}
-	t.Parallel()
 	testenv.MustHaveGoBuild(t)
 	testenv.MustHaveCGO(t)
 	testenv.MustHaveExecPath(t, "gcc")
@@ -207,7 +205,6 @@ func TestLibraryCtrlHandler(t *testing.T) {
 	if runtime.GOARCH != "amd64" {
 		t.Skip("this test can only run on windows/amd64")
 	}
-	t.Parallel()
 	testenv.MustHaveGoBuild(t)
 	testenv.MustHaveCGO(t)
 	testenv.MustHaveExecPath(t, "gcc")
@@ -274,7 +271,6 @@ func TestIssue59213(t *testing.T) {
 	if *flagQuick {
 		t.Skip("-quick")
 	}
-	t.Parallel()
 	testenv.MustHaveGoBuild(t)
 	testenv.MustHaveCGO(t)
 
@@ -294,6 +290,8 @@ func TestIssue59213(t *testing.T) {
 	cc := goEnv("CC")
 	cgoCflags := goEnv("CGO_CFLAGS")
 
+	t.Parallel()
+
 	tmpdir := t.TempDir()
 	dllfile := filepath.Join(tmpdir, "test.dll")
 	exefile := filepath.Join(tmpdir, "gotest.exe")
diff --git a/src/runtime/stack_test.go b/src/runtime/stack_test.go
index 909e69e58a..600e80d8bf 100644
--- a/src/runtime/stack_test.go
+++ b/src/runtime/stack_test.go
@@ -80,7 +80,6 @@ func TestStackGrowth(t *testing.T) {
 	if *flagQuick {
 		t.Skip("-quick")
 	}
-	t.Parallel()
 
 	var wg sync.WaitGroup