diff --git a/vlib/os/os_test.v b/vlib/os/os_test.v
index d0004e2ef8..c1b3b69956 100644
--- a/vlib/os/os_test.v
+++ b/vlib/os/os_test.v
@@ -30,4 +30,6 @@ fn test_write_and_read_string_to_file() {
     return
   }
   assert hello == read_hello
+
+  os.rm(filename)
 }