diff --git a/src/utils/misc.rs b/src/utils/misc.rs
index 7785bf5..9338eac 100644
--- a/src/utils/misc.rs
+++ b/src/utils/misc.rs
@@ -56,8 +56,12 @@ impl Responder for Html {
 }
 
 /// Read a file
-#[cached]
 pub fn read_file(filename: FilePath, expected_file: MType) -> Option<File> {
+    read_file_aux(filename, expected_file)
+}
+
+#[cached]
+fn read_file_aux(filename: FilePath, expected_file: MType) -> Option<File> {
     let as_str = filename.to_string();
     Path::new(&as_str)
         .extension()