diff --git a/include/ctrl_utils/filesystem.h b/include/ctrl_utils/filesystem.h
index d5ff05c..c69b290 100644
--- a/include/ctrl_utils/filesystem.h
+++ b/include/ctrl_utils/filesystem.h
@@ -56,10 +56,15 @@ class path {
     if (idx_start == idx_end) {
       return str_.substr(idx_start);
     } else {
-      return str_.substr(idx_start, idx_end);
+      return str_.substr(idx_start, idx_end - idx_start);
     }
   }
 
+  path filename() const {
+    const size_t idx_start = str_.find_last_of("/\\") + 1;
+    return str_.substr(idx_start);
+  }
+
   bool operator==(const path& other) const { return str_ == other.str_; }
 
  private: