diff --git a/libc/include/sys/socket.h b/libc/include/sys/socket.h
index 3b11d20..ae2f238 100644
--- a/libc/include/sys/socket.h
+++ b/libc/include/sys/socket.h
@@ -40,13 +40,6 @@
 #include <linux/types.h>
 #include <linux/compiler.h>
 
-/* This is an Android extension that won't be in the uapi headers for the common kernel. */
-#if !defined(SIOCKILLADDR)
-#define SIOCKILLADDR 0x8939
-#else
-#error SIOCKILLADDR defined twice
-#endif
-
 __BEGIN_DECLS
 
 #define sockaddr_storage __kernel_sockaddr_storage