diff --git a/mod.zig b/mod.zig
index 83a9dd37f75ca31edd32f19aadfdc9478cbda045..cfb98f41314155fcab26bb6908619e1c7dc3df82 100644
--- a/mod.zig
+++ b/mod.zig
@@ -993,7 +993,13 @@ pub const quotactl = @compileError("TODO: quotactl");
 // gettid
 // pid_t gettid(void);
 // asmlinkage long sys_gettid(void);
-pub const gettid = @compileError("TODO: gettid");
+pub fn gettid() errno.Error!pid_t {
+    const r = syscall0(.gettid);
+    return switch (_errno(r)) {
+        .ok => @intCast(r),
+        _ => |c| errno.errorFromInt(@intFromEnum(c)),
+    };
+}
 
 // readahead
 // ssize_t readahead(int fd, off_t offset, size_t count);
diff --git a/test.zig b/test.zig
index ddab99131ddb76fa37f16571103597ba7e2daa80..3516b1d765694169033fa1726d9d0da75c66a48b 100644
--- a/test.zig
+++ b/test.zig
@@ -22,4 +22,5 @@ test {
     _ = &linux.munlockall;
     _ = &linux.vhangup;
     _ = &linux.sync;
+    _ = &linux.gettid;
 }