diff --git a/libc/Android.bp b/libc/Android.bp
index c5ed234..b86313c 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -2300,7 +2300,6 @@
     ],
     arch: {
         arm64: {
-            cflags: ["-DHAVE_ASSEMBLER___MEMCPY_CHK"],
             srcs: [
                 "arch-arm64/string/__memcpy_chk.S",
             ],