diff --git a/OOP_zadanie2/UserInteraction.h b/OOP_zadanie2/UserInteraction.h
index 93dd50d..20ee478 100644
--- a/OOP_zadanie2/UserInteraction.h
+++ b/OOP_zadanie2/UserInteraction.h
@@ -66,7 +66,7 @@ private:
 				triangleSideValueList.push_back(tmp);
 				return true;
 			}
-			throw exception("Triangle side must be positive number.\n");
+			throw runtime_error("Triangle side must be positive number.\n");
 
 		}
 		catch (const std::exception& e)