diff --git a/libc/arch-x86/syscalls/dup.S b/libc/arch-x86/syscalls/dup.S
index 98070e2..ed922de 100644
--- a/libc/arch-x86/syscalls/dup.S
+++ b/libc/arch-x86/syscalls/dup.S
@@ -4,7 +4,7 @@
 
 ENTRY(dup)
     pushl   %ebx
-    .cfi_def_cfa_offset 4
+    .cfi_def_cfa_offset 8
     .cfi_rel_offset ebx, 0
     mov     8(%esp), %ebx
     movl    $__NR_dup, %eax