diff --git a/libc/arch-arm/syscalls/futex.S b/libc/arch-arm/syscalls/futex.S
index a553b7e..1646ca2 100644
--- a/libc/arch-arm/syscalls/futex.S
+++ b/libc/arch-arm/syscalls/futex.S
@@ -4,12 +4,17 @@
 
 ENTRY(futex)
     mov     ip, sp
-    .save   {r4, r5, r6, r7}
     stmfd   sp!, {r4, r5, r6, r7}
+    .cfi_def_cfa_offset 16
+    .cfi_rel_offset r4, 0
+    .cfi_rel_offset r5, 4
+    .cfi_rel_offset r6, 8
+    .cfi_rel_offset r7, 12
     ldmfd   ip, {r4, r5, r6}
     ldr     r7, =__NR_futex
     swi     #0
     ldmfd   sp!, {r4, r5, r6, r7}
+    .cfi_def_cfa_offset 0
     cmn     r0, #(MAX_ERRNO + 1)
     bxls    lr
     neg     r0, r0