diff --git a/libc/upstream-freebsd/android/include/freebsd-compat.h b/libc/upstream-freebsd/android/include/freebsd-compat.h
index 6f7a3f0..3228701 100644
--- a/libc/upstream-freebsd/android/include/freebsd-compat.h
+++ b/libc/upstream-freebsd/android/include/freebsd-compat.h
@@ -47,4 +47,6 @@
 /* FreeBSD has this, but we can't really implement it correctly on Linux. */
 #define issetugid() 0
 
+#define __compiler_membar() __asm __volatile(" " : : : "memory")
+
 #endif
diff --git a/libc/upstream-freebsd/android/include/machine/atomic.h b/libc/upstream-freebsd/android/include/machine/atomic.h
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libc/upstream-freebsd/android/include/machine/atomic.h