--- a/servo/components/style/build_gecko.rs
+++ b/servo/components/style/build_gecko.rs
@@ -94,17 +94,17 @@ mod bindings {
             if let Some(path) = search_include(cap.at(1).unwrap()) {
                 add_headers_recursively(path, added_paths);
             }
         }
     }
 
     fn add_include(name: &str) -> String {
         let mut added_paths = ADDED_PATHS.lock().unwrap();
-        let file = search_include(name).unwrap();
+        let file = search_include(name).expect("Include not found!");
         let result = String::from(file.to_str().unwrap());
         add_headers_recursively(file, &mut *added_paths);
         result
     }
 
     trait BuilderExt {
         fn get_initial_builder(build_type: BuildType) -> Builder;
         fn include<T: Into<String>>(self, file: T) -> Builder;