diff --git a/src/spec.rs b/src/spec.rs
index 8a6feff0..d77c6daa 100644
--- a/src/spec.rs
+++ b/src/spec.rs
@@ -653,6 +653,9 @@ pub(crate) fn is_dir(filename: &str) -> bool {
 pub(crate) fn path_to_string<T: AsRef<Path>>(path: T) -> Box<str> {
     let mut maybe_original = None;
     if let Some(original) = path.as_ref().to_str() {
+        if (original.len() == 0) {
+            return String::new().into_boxed_str();
+        }
         if (MAIN_SEPARATOR == '/' || !original[1..].contains(MAIN_SEPARATOR))
             && !original.ends_with('.')
             && !original.starts_with(['.', MAIN_SEPARATOR])