diff --git a/mod.zig b/mod.zig
index 4dd50378701f66b4c3c1bba6a5892f72a8f9f401..7b47d580bf20bd7b27f859614f6e42deb7af656b 100644
--- a/mod.zig
+++ b/mod.zig
@@ -2750,6 +2750,7 @@ pub const libc = struct {
     pub extern fn getdents(dirfd: c_int, buf: [*]u8, nbytes: usize) c_int;
     pub extern fn sched_getaffinity(pid: pid_t, cpusetsize: usize, mask: *cpu_set_t) c_int;
     pub extern fn getrandom(buf: [*]u8, size: usize, flags: c_uint) isize;
+    pub extern fn flock(fd: c_int, op: c_int) c_int;
 };
 
 pub const clock_t = c_long;
@@ -3206,6 +3207,13 @@ pub const GRND = struct {
     pub const INSECURE = 0x0004;
 };
 
+pub const LOCK = struct {
+    pub const SH = 1;
+    pub const EX = 2;
+    pub const NB = 4;
+    pub const UN = 8;
+};
+
 pub fn getpid() pid_t {
     return libc.getpid();
 }
@@ -3499,3 +3507,8 @@ pub fn getrandom(buf: []u8, flags: c_uint) ![]u8 {
     std.debug.assert(rc >= 0);
     return buf[0..@intCast(rc)];
 }
+pub fn flock(fd: c_int, op: c_int) !void {
+    const rc = libc.flock(fd, op);
+    if (rc == -1) return errno.fromInt(errno.fromLibC());
+    std.debug.assert(rc == 0);
+}
diff --git a/test.zig b/test.zig
index 29f1b12d7d8c3d043f263927d3267c725cb3d1b6..63a51d0f57fd78244ee29e29e3c8e290a41854d7 100644
--- a/test.zig
+++ b/test.zig
@@ -60,4 +60,5 @@ test {
     _ = &linux.pthread_cond_broadcast;
     _ = &linux.mkdtemp;
     _ = &linux.getrandom;
+    _ = &linux.flock;
 }