diff --git a/libimagref/src/reference.rs b/libimagref/src/reference.rs
index 7121fcec..ca8ca190 100644
--- a/libimagref/src/reference.rs
+++ b/libimagref/src/reference.rs
@@ -204,8 +204,8 @@ impl<'a> Ref<'a> {
     }
 
     /// Alias for `r.fs_link_exists() && r.deref().is_dir()`
-    pub fn is_ref_to_dir(&self) -> bool {
-        unimplemented!()
+    pub fn is_ref_to_dir(&self) -> Result<bool> {
+        self.fs_file().map(|pathbuf| pathbuf.is_dir())
     }
 
     /// Alias for `!Ref::fs_link_exists()`