diff --git a/tests/fs.rs b/tests/fs.rs
index 43d11f4be..738ec06d6 100644
--- a/tests/fs.rs
+++ b/tests/fs.rs
@@ -14,9 +14,15 @@ async fn file() {
 
     let contents = fs::read("README.md").expect("fs::read README.md");
     assert_eq!(res.headers()["content-length"], contents.len().to_string());
-    assert_eq!(res.headers()["content-type"], "text/x-markdown");
     assert_eq!(res.headers()["accept-ranges"], "bytes");
 
+    let ct = &res.headers()["content-type"];
+    assert!(
+        ct == "text/x-markdown" || ct == "text/markdown",
+        "content-type is not markdown: {:?}",
+        ct,
+    );
+
     assert_eq!(res.body(), &*contents);
 }