diff --git a/src/builder/mod.rs b/src/builder/mod.rs
index ffd116e..444edc3 100644
--- a/src/builder/mod.rs
+++ b/src/builder/mod.rs
@@ -41,7 +41,7 @@ impl Builder {
         Ok(self
             .in_file
             .parent()
-            .expect("Directory has no root")
+            .ok_or("File does not have a parent")?
             .to_path_buf())
     }