diff --git a/src/build.rs b/src/build.rs
index accc8de..02566e2 100644
--- a/src/build.rs
+++ b/src/build.rs
@@ -44,9 +44,8 @@ pub fn create_static_output_files(source_dir: &str) {
       }
     }
     Err(err) => {
-      if err.kind() == NotFound {
-      } else {
-        Err(err).unwrap();
+      if err.kind() != NotFound {
+        panic!("Unexpected error: {}", err)
       }
     }
   }