diff --git a/src/libos/src/syscall/mod.rs b/src/libos/src/syscall/mod.rs
index ebd39052..958b6f71 100644
--- a/src/libos/src/syscall/mod.rs
+++ b/src/libos/src/syscall/mod.rs
@@ -81,6 +81,7 @@ pub extern "C" fn dispatch_syscall(
         ),
         SYS_WAIT4 => do_wait4(arg0 as i32, arg1 as *mut i32),
         SYS_GETPID => do_getpid(),
+        SYS_GETTID => do_gettid(),
         SYS_GETPPID => do_getppid(),
 
         SYS_CLONE => do_clone(
@@ -534,6 +535,11 @@ fn do_getpid() -> Result<isize, Error> {
     Ok(pid as isize)
 }
 
+fn do_gettid() -> Result<isize, Error> {
+    let tid = process::do_gettid();
+    Ok(tid as isize)
+}
+
 fn do_getppid() -> Result<isize, Error> {
     let ppid = process::do_getppid();
     Ok(ppid as isize)