diff --git a/libc/arch-x86/syscalls/__getcpu.S b/libc/arch-x86/syscalls/__getcpu.S
index cef5f18..d1da871 100644
--- a/libc/arch-x86/syscalls/__getcpu.S
+++ b/libc/arch-x86/syscalls/__getcpu.S
@@ -6,6 +6,10 @@
     pushl   %ebx
     pushl   %ecx
     pushl   %edx
+    .cfi_def_cfa_offset 12
+    .cfi_rel_offset ebx, 0
+    .cfi_rel_offset ecx, 4
+    .cfi_rel_offset edx, 8
     mov     16(%esp), %ebx
     mov     20(%esp), %ecx
     mov     24(%esp), %edx