diff --git a/main/main.cpp b/main/main.cpp
index 010c506..e511466 100755
--- a/main/main.cpp
+++ b/main/main.cpp
@@ -20,7 +20,7 @@
 #include "steps/step1.h"
 #include "steps/step2.h"
 #include "steps/step3.hpp"
-#include "steps/step4.hpp"
+#include "steps/step4.h"
 #include "steps/step5.hpp"
 #include "steps/step6.h"