diff --git a/libc/include/sys/socket.h b/libc/include/sys/socket.h
index f33f112fc..41c5a9ad2 100644
--- a/libc/include/sys/socket.h
+++ b/libc/include/sys/socket.h
@@ -116,22 +116,7 @@ struct cmsghdr {
    ? (struct cmsghdr*) (msg)->msg_control : (struct cmsghdr*) NULL)
 #define CMSG_OK(mhdr, cmsg) ((cmsg)->cmsg_len >= sizeof(struct cmsghdr) &&   (cmsg)->cmsg_len <= (unsigned long)   ((mhdr)->msg_controllen -   ((char*)(cmsg) - (char*)(mhdr)->msg_control)))
 
-#if __ANDROID_API__ >= 21
 struct cmsghdr* __cmsg_nxthdr(struct msghdr* __msg, struct cmsghdr* __cmsg) __INTRODUCED_IN(21);
-#else
-/* TODO(danalbert): Move this into libandroid_support. */
-static inline struct cmsghdr* __cmsg_nxthdr(struct msghdr* msg, struct cmsghdr* cmsg) {
-  struct cmsghdr* ptr =
-      __BIONIC_CAST(reinterpret_cast, struct cmsghdr*,
-                    (__BIONIC_CAST(reinterpret_cast, char*, cmsg) + CMSG_ALIGN(cmsg->cmsg_len)));
-  size_t len = __BIONIC_CAST(reinterpret_cast, char*, ptr + 1) -
-               __BIONIC_CAST(reinterpret_cast, char*, msg->msg_control);
-  if (len > msg->msg_controllen) {
-    return NULL;
-  }
-  return ptr;
-}
-#endif
 
 #define SCM_RIGHTS 0x01
 #define SCM_CREDENTIALS 0x02