diff --git a/src/net/dnsclient_unix_test.go b/src/net/dnsclient_unix_test.go
index d046fc415e..1b88e7762b 100644
--- a/src/net/dnsclient_unix_test.go
+++ b/src/net/dnsclient_unix_test.go
@@ -101,7 +101,7 @@ type resolvConfTest struct {
 }
 
 func newResolvConfTest(t *testing.T) *resolvConfTest {
-	dir, err := ioutil.TempDir("", "resolvConfTest")
+	dir, err := ioutil.TempDir("", "go-resolvconftest")
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/src/net/error_test.go b/src/net/error_test.go
index 9776a2a3b0..c65d3f9d8a 100644
--- a/src/net/error_test.go
+++ b/src/net/error_test.go
@@ -524,10 +524,11 @@ func TestFileError(t *testing.T) {
 		t.Skip("not supported on %s", runtime.GOOS)
 	}
 
-	f, err := ioutil.TempFile("", "nettest")
+	f, err := ioutil.TempFile("", "go-nettest")
 	if err != nil {
 		t.Fatal(err)
 	}
+	defer os.Remove(f.Name())
 	defer f.Close()
 
 	c, err := FileConn(f)
diff --git a/src/net/mockserver_test.go b/src/net/mockserver_test.go
index 75085a5535..62bcfa4022 100644
--- a/src/net/mockserver_test.go
+++ b/src/net/mockserver_test.go
@@ -18,7 +18,7 @@ import (
 // It also uses /tmp directory in case it is prohibited to create UNIX
 // sockets in TMPDIR.
 func testUnixAddr() string {
-	f, err := ioutil.TempFile("", "nettest")
+	f, err := ioutil.TempFile("", "go-nettest")
 	if err != nil {
 		panic(err)
 	}