diff --git a/libc/upstream-openbsd/android/include/arith.h b/libc/upstream-openbsd/android/include/arith.h
index cb116d4..554aa85 100644
--- a/libc/upstream-openbsd/android/include/arith.h
+++ b/libc/upstream-openbsd/android/include/arith.h
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#pragma once
+
 #define IEEE_8087
 
 #if defined(__LP64__)
diff --git a/libc/upstream-openbsd/android/include/openbsd-compat.h b/libc/upstream-openbsd/android/include/openbsd-compat.h
index 2c8c735..afd1077 100644
--- a/libc/upstream-openbsd/android/include/openbsd-compat.h
+++ b/libc/upstream-openbsd/android/include/openbsd-compat.h
@@ -14,34 +14,20 @@
  * limitations under the License.
  */
 
-#ifndef _BIONIC_OPENBSD_COMPAT_H_included
-#define _BIONIC_OPENBSD_COMPAT_H_included
+#pragma once
 
 #define _BSD_SOURCE
 #include <sys/cdefs.h>
 
 #include <stddef.h> // For size_t.
 
-// TODO: libandroid_support uses this file, so we need to wait for
-// <sys/random.h> to be in the NDK headers before we can lose this declaration.
-//#include <sys/random.h> // For getentropy.
-int getentropy(void*, size_t);
+#include <sys/random.h> // For getentropy.
 
 #define __BEGIN_HIDDEN_DECLS _Pragma("GCC visibility push(hidden)")
 #define __END_HIDDEN_DECLS _Pragma("GCC visibility pop")
 
 extern const char* __progname;
 
-/* Redirect internal C library calls to the public function. */
-#define _err err
-#define _errx errx
-#define _verr verr
-#define _verrx verrx
-#define _vwarn vwarn
-#define _vwarnx vwarnx
-#define _warn warn
-#define _warnx warnx
-
 /* Ignore all DEF_STRONG/DEF_WEAK in OpenBSD. */
 #define DEF_STRONG(sym)
 #define DEF_WEAK(sym)
@@ -82,5 +68,3 @@
 
 __LIBC_HIDDEN__ extern char* __findenv(const char*, int, int*);
 __LIBC_HIDDEN__ extern char* _mktemp(char*);
-
-#endif