diff --git a/include/types/pid.h b/include/types/pid.h
index b6fc082..a2dc50c 100644
--- a/include/types/pid.h
+++ b/include/types/pid.h
@@ -1,5 +1,5 @@
-#ifndef _QUARK_PID_H
-#define _QUARK_PID_H
+#ifndef QUARK_PID_H
+#define QUARK_PID_H
 
 typedef unsigned int pid_t;