diff --git a/01_ENV/func1.c b/01_ENV/func1.c
index 0dc0564..db6583d 100644
--- a/01_ENV/func1.c
+++ b/01_ENV/func1.c
@@ -1,5 +1,5 @@
 #include <stdio.h>
-#include <math.h>
+#include "math.h"
 
 #define func1