diff --git a/src/wutil/dir_iter.rs b/src/wutil/dir_iter.rs
index 5ae312a49..165075b4b 100644
--- a/src/wutil/dir_iter.rs
+++ b/src/wutil/dir_iter.rs
@@ -54,7 +54,8 @@ pub struct DirEntry {
 
 impl DirEntry {
     /// Return the type of this entry if it is already available, otherwise none().
-    pub fn fast_type(&self) -> Option<DirEntryType> {
+    #[cfg(test)]
+    fn fast_type(&self) -> Option<DirEntryType> {
         self.typ.get()
     }