diff --git a/3_RootkitTechniques/3.7_char_interfering/rootkit.c b/3_RootkitTechniques/3.7_char_interfering/rootkit.c
index dc377f0..77461bc 100644
--- a/3_RootkitTechniques/3.7_char_interfering/rootkit.c
+++ b/3_RootkitTechniques/3.7_char_interfering/rootkit.c
@@ -3,6 +3,7 @@
 #include <linux/kernel.h>
 #include <linux/syscalls.h>
 #include <linux/kallsyms.h>
+#include <linux/version.h>
 
 #include "ftrace_helper.h"