diff --git a/src/runtime/crash_cgo_test.go b/src/runtime/crash_cgo_test.go
index 023c89350f..9754b5a4d4 100644
--- a/src/runtime/crash_cgo_test.go
+++ b/src/runtime/crash_cgo_test.go
@@ -713,7 +713,10 @@ func TestCgoTracebackGoroutineProfile(t *testing.T) {
 
 func TestCgoTraceParser(t *testing.T) {
 	// Test issue 29707.
-	testenv.MustHaveCGO(t)
+	switch runtime.GOOS {
+	case "plan9", "windows":
+		t.Skipf("no pthreads on %s", runtime.GOOS)
+	}
 	output := runTestProg(t, "testprogcgo", "CgoTraceParser")
 	want := "OK\n"
 	if output != want {
@@ -723,7 +726,10 @@ func TestCgoTraceParser(t *testing.T) {
 
 func TestCgoTraceParserWithOneProc(t *testing.T) {
 	// Test issue 29707.
-	testenv.MustHaveCGO(t)
+	switch runtime.GOOS {
+	case "plan9", "windows":
+		t.Skipf("no pthreads on %s", runtime.GOOS)
+	}
 	output := runTestProg(t, "testprogcgo", "CgoTraceParser", "GOMAXPROCS=1")
 	want := "OK\n"
 	if output != want {
diff --git a/src/runtime/testdata/testprogcgo/issue29707.go b/src/runtime/testdata/testprogcgo/issue29707.go
index 5d3e65eee4..95964b111b 100644
--- a/src/runtime/testdata/testprogcgo/issue29707.go
+++ b/src/runtime/testdata/testprogcgo/issue29707.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix
+//go:build !plan9 && !windows
+// +build !plan9,!windows
 
 // This is for issue #29707