diff --git a/libc/tools/gensyscalls.py b/libc/tools/gensyscalls.py
index f7785d6..04ccf39 100755
--- a/libc/tools/gensyscalls.py
+++ b/libc/tools/gensyscalls.py
@@ -62,9 +62,11 @@
 
 arm_eabi_call_default = syscall_stub_header + """\
     mov     ip, r7
+    .cfi_register r7, ip
     ldr     r7, =%(__NR_name)s
     swi     #0
     mov     r7, ip
+    .cfi_restore r7
     cmn     r0, #(MAX_ERRNO + 1)
     bxls    lr
     neg     r0, r0