diff --git a/ndn-cpp/c/transport/udp-transport.h b/ndn-cpp/c/transport/udp-transport.h
index c6e77bf..82aee19 100644
--- a/ndn-cpp/c/transport/udp-transport.h
+++ b/ndn-cpp/c/transport/udp-transport.h
@@ -6,11 +6,11 @@
  */
 
 #ifndef NDN_UDPTRANSPORT_H
-#define	NDN_UDPTRANSPORT_H
+#define NDN_UDPTRANSPORT_H
 
 #include "socket-transport.h"
 
-#ifdef	__cplusplus
+#ifdef __cplusplus
 extern "C" {
 #endif
 
@@ -44,7 +44,7 @@
   return ndn_SocketTransport_close(&self->base);
 }
 
-#ifdef	__cplusplus
+#ifdef __cplusplus
 }
 #endif