diff --git a/mod.zig b/mod.zig
index 8515021af2ec3450cde92d7bbc9eb3a716b38817..f18407b238d231220194c2bbe64ff7783b8b91a6 100644
--- a/mod.zig
+++ b/mod.zig
@@ -865,7 +865,13 @@ pub const mlockall = @compileError("TODO: mlockall");
 // munlockall
 // int munlockall(void);
 // asmlinkage long sys_munlockall(void);
-pub const munlockall = @compileError("TODO: munlockall");
+pub fn munlockall() errno.Error!c_int {
+    const r = syscall0(.munlockall);
+    return switch (_errno(r)) {
+        .ok => @intCast(r),
+        _ => |c| errno.errorFromInt(@intFromEnum(c)),
+    };
+}
 
 // vhangup
 // int vhangup(void);
diff --git a/test.zig b/test.zig
index 478db29e179388c80ac5380be1ba5185621f3876..52cb51db17fbec727d27262bb271cd9a6895aa53 100644
--- a/test.zig
+++ b/test.zig
@@ -19,4 +19,5 @@ test {
     _ = &linux.getppid;
     _ = &linux.getpgrp;
     _ = &linux.setsid;
+    _ = &linux.munlockall;
 }