diff --git a/graph.h b/graph.hpp
similarity index 100%
rename from graph.h
rename to graph.hpp
diff --git a/main.cpp b/main.cpp
index 65e8eb0..c4bd23d 100644
--- a/main.cpp
+++ b/main.cpp
@@ -2,7 +2,7 @@
 #include <cassert>
 
 
-#include "graph.h"
+#include "graph.hpp"
 
 int main()
 {