diff --git a/src/router/handlers/fixed.rs b/src/router/handlers/fixed.rs
index 770d139..b6e5e5f 100644
--- a/src/router/handlers/fixed.rs
+++ b/src/router/handlers/fixed.rs
@@ -738,7 +738,7 @@ mod tests {
 #[cfg(test)]
 #[expect(clippy::panic_in_result_fn)]
 mod serial_tests {
-    use std::{fs, os::unix::fs::PermissionsExt as _};
+    use std::{fs, os::unix::fs::PermissionsExt};
 
     use super::*;
     use crate::dev::test::{Directories, Error};
@@ -755,6 +755,9 @@ mod serial_tests {
         permissions.set_mode(0o200);
         fs::set_permissions(&file, permissions)?;
 
+        let permissions = fs::metadata(&file)?.permissions();
+        assert_eq!(0o200, permissions.mode());
+
         let error = fallback("unreadable.png", &Graph::default()).unwrap_err();
 
         assert!(matches!(&error.kind, AssetErrorKind::IO));