diff --git a/libc/arch-x86/syscalls/wait4.S b/libc/arch-x86/syscalls/wait4.S
index bed7c40..281d5f2 100644
--- a/libc/arch-x86/syscalls/wait4.S
+++ b/libc/arch-x86/syscalls/wait4.S
@@ -15,12 +15,20 @@
     pushl   %esi
     .cfi_adjust_cfa_offset 4
     .cfi_rel_offset esi, 0
-    mov     20(%esp), %ebx
-    mov     24(%esp), %ecx
-    mov     28(%esp), %edx
-    mov     32(%esp), %esi
+
+    call    __kernel_syscall
+    pushl   %eax
+    .cfi_adjust_cfa_offset 4
+    .cfi_rel_offset eax, 0
+
+    mov     24(%esp), %ebx
+    mov     28(%esp), %ecx
+    mov     32(%esp), %edx
+    mov     36(%esp), %esi
     movl    $__NR_wait4, %eax
-    int     $0x80
+    call    *(%esp)
+    addl    $4, %esp
+
     cmpl    $-MAX_ERRNO, %eax
     jb      1f
     negl    %eax