diff --git a/libc/arch-x86/syscalls/gettid.S b/libc/arch-x86/syscalls/gettid.S
new file mode 100644
index 0000000..2e8cb59
--- /dev/null
+++ b/libc/arch-x86/syscalls/gettid.S
@@ -0,0 +1,20 @@
+/* autogenerated by gensyscalls.py */
+#include <sys/linux-syscalls.h>
+
+    .text
+    .type gettid, @function
+    .globl gettid
+    .align 4
+
+gettid:
+    movl    $__NR_gettid, %eax
+    int     $0x80
+    cmpl    $-129, %eax
+    jb      1f
+    negl    %eax
+    pushl   %eax
+    call    __set_errno
+    addl    $4, %esp
+    orl     $-1, %eax
+1:
+    ret