diff --git a/libc/arch-x86/syscalls/madvise.S b/libc/arch-x86/syscalls/madvise.S
index b69f5d4..21f472e 100644
--- a/libc/arch-x86/syscalls/madvise.S
+++ b/libc/arch-x86/syscalls/madvise.S
@@ -12,11 +12,19 @@
     pushl   %edx
     .cfi_adjust_cfa_offset 4
     .cfi_rel_offset edx, 0
-    mov     16(%esp), %ebx
-    mov     20(%esp), %ecx
-    mov     24(%esp), %edx
+
+    call    __kernel_syscall
+    pushl   %eax
+    .cfi_adjust_cfa_offset 4
+    .cfi_rel_offset eax, 0
+
+    mov     20(%esp), %ebx
+    mov     24(%esp), %ecx
+    mov     28(%esp), %edx
     movl    $__NR_madvise, %eax
-    int     $0x80
+    call    *(%esp)
+    addl    $4, %esp
+
     cmpl    $-MAX_ERRNO, %eax
     jb      1f
     negl    %eax