diff --git a/libc/arch-arm64/generic/bionic/memcpy.S b/libc/arch-arm64/generic/bionic/memcpy.S
index 83ab5d1..0be2aac 100644
--- a/libc/arch-arm64/generic/bionic/memcpy.S
+++ b/libc/arch-arm64/generic/bionic/memcpy.S
@@ -31,29 +31,18 @@
 #include <private/bionic_asm.h>
 
 ENTRY(__memcpy_chk)
-  cmp   x2, x3
-  b.hi  __memcpy_chk_fail
+  cmp x2, x3
+  bls memcpy
 
-  // Fall through to memcpy...
+  // Preserve for accurate backtrace.
+  stp x29, x30, [sp, -16]!
+  .cfi_def_cfa_offset 16
+  .cfi_rel_offset x29, 0
+  .cfi_rel_offset x30, 8
+
+  bl __memcpy_chk_fail
 END(__memcpy_chk)
 
 ENTRY(memcpy)
   #include "memcpy_base.S"
 END(memcpy)
-
-ENTRY_PRIVATE(__memcpy_chk_fail)
-  // Preserve for accurate backtrace.
-  stp  x29, x30, [sp, -16]!
-  .cfi_def_cfa_offset 16
-  .cfi_rel_offset x29, 0
-  .cfi_rel_offset x30, 8
-
-  adrp  x0, error_string
-  add   x0, x0, :lo12:error_string
-  bl    __fortify_fatal
-END(__memcpy_chk_fail)
-
-  .data
-  .align 2
-error_string:
-  .string "memcpy: prevented write past end of buffer"