diff --git a/libc/upstream-netbsd/android/include/env.h b/libc/upstream-netbsd/android/include/env.h
index 8f99f9d..e69de29 100644
--- a/libc/upstream-netbsd/android/include/env.h
+++ b/libc/upstream-netbsd/android/include/env.h
@@ -1,22 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef _BIONIC_NETBSD_ENV_H_included
-#define _BIONIC_NETBSD_ENV_H_included
-
-/* Placeholder. */
-
-#endif
diff --git a/libc/upstream-netbsd/android/include/extern.h b/libc/upstream-netbsd/android/include/extern.h
index 616becd..b8e6151 100644
--- a/libc/upstream-netbsd/android/include/extern.h
+++ b/libc/upstream-netbsd/android/include/extern.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _BIONIC_NETBSD_EXTERN_H_included
-#define _BIONIC_NETBSD_EXTERN_H_included
+#pragma once
 
 #include <sys/cdefs.h>
 
@@ -24,5 +23,3 @@
 const char* __strsignal(int, char*, size_t);
 
 __END_DECLS
-
-#endif
diff --git a/libc/upstream-netbsd/android/include/namespace.h b/libc/upstream-netbsd/android/include/namespace.h
index 630ea9b..ae7585c 100644
--- a/libc/upstream-netbsd/android/include/namespace.h
+++ b/libc/upstream-netbsd/android/include/namespace.h
@@ -14,10 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _BIONIC_NETBSD_NAMESPACE_H_included
-#define _BIONIC_NETBSD_NAMESPACE_H_included
+#pragma once
 
 __LIBC_HIDDEN__ int __res_enable_mt(void);
 __LIBC_HIDDEN__ int __res_disable_mt(void);
-
-#endif
diff --git a/libc/upstream-netbsd/android/include/netbsd-compat.h b/libc/upstream-netbsd/android/include/netbsd-compat.h
index af5ae29..ea630b2 100644
--- a/libc/upstream-netbsd/android/include/netbsd-compat.h
+++ b/libc/upstream-netbsd/android/include/netbsd-compat.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _BIONIC_NETBSD_COMPAT_H_included
-#define _BIONIC_NETBSD_COMPAT_H_included
+#pragma once
 
 #define _BSD_SOURCE
 #define _GNU_SOURCE
@@ -47,5 +46,3 @@
 /* Use appropriate shell depending on process's executable. */
 __LIBC_HIDDEN__ extern const char* __bionic_get_shell_path();
 #define _PATH_BSHELL __bionic_get_shell_path()
-
-#endif
diff --git a/libc/upstream-netbsd/android/include/port_after.h b/libc/upstream-netbsd/android/include/port_after.h
index 3f8b6f8..e69de29 100644
--- a/libc/upstream-netbsd/android/include/port_after.h
+++ b/libc/upstream-netbsd/android/include/port_after.h
@@ -1,20 +0,0 @@
-/*
- * Copyright (C) 2012 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef _BIONIC_NETBSD_PORT_BEFORE_H_included
-#define _BIONIC_NETBSD_PORT_BEFORE_H_included
-
-#endif
diff --git a/libc/upstream-netbsd/android/include/port_before.h b/libc/upstream-netbsd/android/include/port_before.h
index 9fa9487..8266f81 100644
--- a/libc/upstream-netbsd/android/include/port_before.h
+++ b/libc/upstream-netbsd/android/include/port_before.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _BIONIC_NETBSD_PORT_BEFORE_H_included
-#define _BIONIC_NETBSD_PORT_BEFORE_H_included
+#pragma once
 
 #include "namespace.h"
 #include <sys/cdefs.h>
@@ -24,5 +23,3 @@
 
 #define ISC_FORMAT_PRINTF(a,b) __printflike(a,b)
 #define ISC_SOCKLEN_T socklen_t
-
-#endif