diff --git a/app.cpp b/app.cpp
index dbdda96..ccbfe65 100644
--- a/app.cpp
+++ b/app.cpp
@@ -79,7 +79,7 @@
             }
         }
     }
-    catch (std::exception& e)
+    catch (const std::exception& e)
     {
         std::cerr << e.what() << "\n";
     }