diff --git a/lib/std/io/test.zig b/lib/std/io/test.zig
index d6de9122407b02796965aff4ab77a7badf62ff57..b572a7bf924b13da6eba5a54a38f862dd0c8823d 100644
--- a/lib/std/io/test.zig
+++ b/lib/std/io/test.zig
@@ -654,6 +654,7 @@ test "memfd_create" {
     if (builtin.os != .linux) return error.SkipZigTest;
 
     const fd = try std.os.memfd_create("test", 0);
+    defer std.os.close(fd);
     try std.os.write(fd, "test");
     try std.os.lseek_SET(fd, 0);