diff --git a/Gtk4_Reset/src/calc_app/calc.cc b/Gtk4_Reset/src/calc_app/calc.cpp
similarity index 99%
rename from Gtk4_Reset/src/calc_app/calc.cc
rename to Gtk4_Reset/src/calc_app/calc.cpp
index ec312f0..54e7191 100644
--- a/Gtk4_Reset/src/calc_app/calc.cc
+++ b/Gtk4_Reset/src/calc_app/calc.cpp
@@ -2,7 +2,7 @@
 #include <cstdlib>
 #include <cstring>
 #include <cmath>
-#include "calc.hh"
+#include "calc.h"
 
 static int pos = 0;
 
diff --git a/Gtk4_Reset/src/calc_app/calc.hh b/Gtk4_Reset/src/calc_app/calc.h
similarity index 100%
rename from Gtk4_Reset/src/calc_app/calc.hh
rename to Gtk4_Reset/src/calc_app/calc.h