diff --git a/SQCSim-common/bullet.h b/SQCSim-common/bullet.h
index d17000e..e3ae989 100644
--- a/SQCSim-common/bullet.h
+++ b/SQCSim-common/bullet.h
@@ -1,5 +1,6 @@
 #ifndef BULLET_H__
 #define BULLET_H__
+
 #include "define.h"
 #include "vector3.h"
 
diff --git a/SQCSim-common/chunk.h b/SQCSim-common/chunk.h
index ea4a949..b053928 100644
--- a/SQCSim-common/chunk.h
+++ b/SQCSim-common/chunk.h
@@ -1,5 +1,6 @@
 #ifndef CHUNK_H__
 #define CHUNK_H__
+
 #include "define.h"
 #include "array2d.h"
 #include "array3d.h"
diff --git a/SQCSim-common/netprotocol.h b/SQCSim-common/netprotocol.h
index bdaf0a7..d7c7a93 100644
--- a/SQCSim-common/netprotocol.h
+++ b/SQCSim-common/netprotocol.h
@@ -1,5 +1,6 @@
 #ifndef NETPROTOCOL_H__
 #define NETPROTOCOL_H__
+
 #include "define.h"
 #include <string>
 #include "vector3.h"
diff --git a/SQCSim-common/player.h b/SQCSim-common/player.h
index 3856ced..e439fa2 100644
--- a/SQCSim-common/player.h
+++ b/SQCSim-common/player.h
@@ -1,5 +1,6 @@
-#ifndef CLI_PLAYER_H__
-#define CLI_PLAYER_H__
+#ifndef PLAYER_H__
+#define PLAYER_H__
+
 #include <cmath>
 #include "transformation.h"
 #include "vector3.h"
diff --git a/SQCSim-common/world.h b/SQCSim-common/world.h
index 69937aa..d341ee8 100644
--- a/SQCSim-common/world.h
+++ b/SQCSim-common/world.h
@@ -1,5 +1,6 @@
 #ifndef WORLD_H__
 #define WORLD_H__
+
 #include <fstream>
 #include <string>
 #include <vector>
diff --git a/SQCSim-srv/connection.h b/SQCSim-srv/connection.h
index dc1df11..6dee988 100644
--- a/SQCSim-srv/connection.h
+++ b/SQCSim-srv/connection.h
@@ -1,5 +1,6 @@
 #ifndef CONNECTION_H__
 #define CONNECTION_H__
+
 #include <deque>
 #include <map>
 #include "../SQCSim-common/player.h"