diff --git a/k&r/04-funcs-and-prog-struct/04-calc/04-glob-stack.h b/k&r/04-funcs-and-prog-struct/04-calc/global-stack.h
similarity index 100%
rename from k&r/04-funcs-and-prog-struct/04-calc/04-glob-stack.h
rename to k&r/04-funcs-and-prog-struct/04-calc/global-stack.h
diff --git a/k&r/04-funcs-and-prog-struct/04-calc/04-calc.c b/k&r/04-funcs-and-prog-struct/04-calc/main.c
similarity index 99%
rename from k&r/04-funcs-and-prog-struct/04-calc/04-calc.c
rename to k&r/04-funcs-and-prog-struct/04-calc/main.c
index c58666c..2de6753 100644
--- a/k&r/04-funcs-and-prog-struct/04-calc/04-calc.c
+++ b/k&r/04-funcs-and-prog-struct/04-calc/main.c
@@ -4,8 +4,8 @@
 #include <assert.h>
 
 #define MAX_STACK 100
-#include "04-glob-stack.h"
-#include "04-tokens.h"
+#include "global-stack.h"
+#include "tokens.h"
 
 /* --------- ERROR MESSAGES */
 #define printerr(format, ...) printf("error: " format "\n", ##__VA_ARGS__)
diff --git a/k&r/04-funcs-and-prog-struct/04-calc/04-tokens.h b/k&r/04-funcs-and-prog-struct/04-calc/tokens.h
similarity index 100%
rename from k&r/04-funcs-and-prog-struct/04-calc/04-tokens.h
rename to k&r/04-funcs-and-prog-struct/04-calc/tokens.h