diff --git a/libc/arch-arm/syscalls/__getcpu.S b/libc/arch-arm/syscalls/__getcpu.S
index d523d8e..430acb3 100644
--- a/libc/arch-arm/syscalls/__getcpu.S
+++ b/libc/arch-arm/syscalls/__getcpu.S
@@ -4,9 +4,11 @@
 
 ENTRY(__getcpu)
     mov     ip, r7
+    .cfi_register r7, ip
     ldr     r7, =__NR_getcpu
     swi     #0
     mov     r7, ip
+    .cfi_restore r7
     cmn     r0, #(MAX_ERRNO + 1)
     bxls    lr
     neg     r0, r0