diff --git a/libc/arch-x86_64/syscalls/mmap.S b/libc/arch-x86_64/syscalls/mmap.S
index d28cc42..d6f9687 100644
--- a/libc/arch-x86_64/syscalls/mmap.S
+++ b/libc/arch-x86_64/syscalls/mmap.S
@@ -15,3 +15,6 @@
 1:
     ret
 END(mmap)
+
+    .globl _C_LABEL(mmap64)
+    .equ _C_LABEL(mmap64), _C_LABEL(mmap)