diff --git a/Makefile b/Makefile
index f419673..f4c1924 100644
--- a/Makefile
+++ b/Makefile
@@ -8,19 +8,17 @@ SFMLFLAGS = -lsfml-system -lsfml-window -lsfml-graphics
 # If SFML is not installed in a standard path, you need to tell the dynamic linker where to find the SFML libraries first by specifying LD_LIBRARY_PATH:
 # export LD_LIBRARY_PATH=<sfml-install-path>/lib && ./sfml-app
 
-quickhull: main.o Quickhull.h Point.h Line.h Triangle.h Timing.o Display.o
+quickhull: main.o Quickhull.h Point.h Line.h Triangle.h Display.o
 	# link with sfml libs; -lsfml-network -lsfml-audio currently not needed
-	$(CXX) $(CXXFLAGS) -o quickhull main.o Quickhull.h Point.h Line.h Triangle.h Timing.o Display.o $(SFMLFLAGS)
+	$(CXX) $(CXXFLAGS) -o quickhull main.o Quickhull.h Point.h Line.h Triangle.h Display.o $(SFMLFLAGS)
 
 performance: performance.cpp Display.o
 	$(CXX) $(CXXFLAGS) -o performance Display.o performance.cpp $(SFMLFLAGS)
 
-main.o: main.cpp Timing.h
+main.o: main.cpp
 	$(CXX) $(CXXFLAGS) -c main.cpp
 
 Display.o: Display.h
 
-Timing.o: Timing.h
-
 clean :
 	-rm *.o quickhull performance
diff --git a/performance.cpp b/performance.cpp
index f4815ec..a468649 100644
--- a/performance.cpp
+++ b/performance.cpp
@@ -1,3 +1,6 @@
+#include <chrono>
+#include <iostream>
+
 #include "Quickhull.h"
 #include "NumberGenerator.h"
 #include "Display.h"