diff --git a/src/Rectangle/Detection/ContourAnalyzer.cpp b/src/Rectangle/Detection/ContourAnalyzer.cpp
index 4cc8e0b..3ee3e52 100755
--- a/src/Rectangle/Detection/ContourAnalyzer.cpp
+++ b/src/Rectangle/Detection/ContourAnalyzer.cpp
@@ -6,7 +6,6 @@
  */
 
 #include "ContourAnalyzer.h"
-
 #include <cmath>
 
 ContourAnalyzer::ContourAnalyzer(UI *ui) {
@@ -77,7 +76,7 @@ std::string ContourAnalyzer::contourToString(std::vector<cv::Point> contour) {
 		if (cv::isContourConvex(contour)) {
 			return "rectangle";
 		}
-		/* no break */
+		/* no break */
 	default:
 		throw std::invalid_argument("Shape too complex!");
 	}
diff --git a/src/UIListener.hpp b/src/UIListener.hpp
index addc24a..8132b5c 100755
--- a/src/UIListener.hpp
+++ b/src/UIListener.hpp
@@ -4,6 +4,7 @@
 
 class UIListener {
 public:
+	virtual UIListener();
 	virtual void componentSetup() = 0;
 	virtual ~UIListener();
 };