diff --git a/c++/include/dynamixel_sdk/packet_handler.h b/c++/include/dynamixel_sdk/packet_handler.h
index bf7b8b0a6f06ec82151750460407a773660766ca..9bd1be061d3fe8ddc62092285d19f49723d7050b 100644
--- a/c++/include/dynamixel_sdk/packet_handler.h
+++ b/c++/include/dynamixel_sdk/packet_handler.h
@@ -90,10 +90,10 @@ class WINDECLSPEC PacketHandler
 
   virtual float   getProtocolVersion() = 0;
 
-  virtual const char *getTxRxResult(int result) = 0;
-  virtual void    printTxRxResult(int result) = 0;
-  virtual const char *getRxPacketError(uint8_t error) = 0;
-  virtual void    printRxPacketError(uint8_t error) = 0;
+  virtual const char *getTxRxResult     (int result) = 0;
+  virtual void printTxRxResult          (int result) = 0;
+  virtual const char *getRxPacketError  (uint8_t error) = 0;
+  virtual void printRxPacketError       (uint8_t error) = 0;
 
   virtual int txPacket        (PortHandler *port, uint8_t *txpacket) = 0;
   virtual int rxPacket        (PortHandler *port, uint8_t *rxpacket) = 0;
diff --git a/c++/include/dynamixel_sdk/protocol1_packet_handler.h b/c++/include/dynamixel_sdk/protocol1_packet_handler.h
index 44617d586bd54bd0d40403c432fba0fccef0ffca..e61ed3c5fb9724645d71f6c5d9232c6f11a37751 100644
--- a/c++/include/dynamixel_sdk/protocol1_packet_handler.h
+++ b/c++/include/dynamixel_sdk/protocol1_packet_handler.h
@@ -53,10 +53,10 @@ class WINDECLSPEC Protocol1PacketHandler : public PacketHandler
 
   float   getProtocolVersion() { return 1.0; }
 
-  const char *getTxRxResult(int result);
-  void    printTxRxResult(int result);
-  const char *getRxPacketError(uint8_t error);
-  void    printRxPacketError(uint8_t error);
+  const char *getTxRxResult     (int result);
+  void printTxRxResult          (int result);
+  const char *getRxPacketError  (uint8_t error);
+  void printRxPacketError       (uint8_t error);
 
   int txPacket        (PortHandler *port, uint8_t *txpacket);
   int rxPacket        (PortHandler *port, uint8_t *rxpacket);
diff --git a/c++/include/dynamixel_sdk/protocol2_packet_handler.h b/c++/include/dynamixel_sdk/protocol2_packet_handler.h
index 5e4efb78a0ae87f63a0db7dcd3b382d9df9e05c5..8354f3019a11da54c5a3aad1909d026cef738b9e 100644
--- a/c++/include/dynamixel_sdk/protocol2_packet_handler.h
+++ b/c++/include/dynamixel_sdk/protocol2_packet_handler.h
@@ -57,10 +57,10 @@ class WINDECLSPEC Protocol2PacketHandler : public PacketHandler
 
   float   getProtocolVersion() { return 2.0; }
 
-  const char *getTxRxResult(int result);
-  void    printTxRxResult(int result);
-  const char *getRxPacketError(uint8_t error);
-  void    printRxPacketError(uint8_t error);
+  const char *getTxRxResult     (int result);
+  void printTxRxResult          (int result);
+  const char *getRxPacketError  (uint8_t error);
+  void printRxPacketError       (uint8_t error);
 
   int txPacket        (PortHandler *port, uint8_t *txpacket);
   int rxPacket        (PortHandler *port, uint8_t *rxpacket);