1 files changed, 2 insertions, 1 deletions

diff --git a/src/app.hpp b/src/app.hpp
index 12d26b4..a35be27 100644
--- a/src/app.hpp
+++ b/src/app.hpp
@@ -71,7 +71,8 @@ struct id_allocator {
 
    optional<std::string> operator[](unsigned id) {
       auto i = this->surfaces.find(id);
-      return i == this->surfaces.end() ? nullopt : optional<std::string>(i->second);
+      return i == this->surfaces.end() ? nullopt
+                                       : optional<std::string>(i->second);
    }
 };