diff --git a/include/ndn-cpp/c/common.h b/include/ndn-cpp/c/common.h
index 7f47f7a..89392bc 100644
--- a/include/ndn-cpp/c/common.h
+++ b/include/ndn-cpp/c/common.h
@@ -5,7 +5,7 @@
  */
 
 #ifndef NDN_COMMON_H
-#define	NDN_COMMON_H
+#define NDN_COMMON_H
 
 #include "../ndn-cpp-config.h"
 #include <stdint.h>
diff --git a/include/ndn-cpp/c/data-types.h b/include/ndn-cpp/c/data-types.h
index 3c2abce..668786b 100644
--- a/include/ndn-cpp/c/data-types.h
+++ b/include/ndn-cpp/c/data-types.h
@@ -5,9 +5,9 @@
  */
 
 #ifndef NDN_DATA_TYPES_H
-#define	NDN_DATA_TYPES_H
+#define NDN_DATA_TYPES_H
 
-#ifdef	__cplusplus
+#ifdef __cplusplus
 extern "C" {
 #endif
 
@@ -20,7 +20,7 @@
   ndn_ContentType_NACK = 5
 } ndn_ContentType;
 
-#ifdef	__cplusplus
+#ifdef __cplusplus
 }
 #endif
 
diff --git a/include/ndn-cpp/c/forwarding-flags.h b/include/ndn-cpp/c/forwarding-flags.h
index ba6f6b5..863bf04 100644
--- a/include/ndn-cpp/c/forwarding-flags.h
+++ b/include/ndn-cpp/c/forwarding-flags.h
@@ -5,9 +5,9 @@
  */
 
 #ifndef NDN_FORWARDING_FLAGS_H
-#define	NDN_FORWARDING_FLAGS_H
+#define NDN_FORWARDING_FLAGS_H
 
-#ifdef	__cplusplus
+#ifdef __cplusplus
 extern "C" {
 #endif
 
@@ -48,7 +48,7 @@
 void ndn_ForwardingFlags_setForwardingEntryFlags(struct ndn_ForwardingFlags *self, int forwardingEntryFlags);
 
 
-#ifdef	__cplusplus
+#ifdef __cplusplus
 }
 #endif
 
diff --git a/include/ndn-cpp/c/interest-types.h b/include/ndn-cpp/c/interest-types.h
index d6a5e51..21c80d9 100644
--- a/include/ndn-cpp/c/interest-types.h
+++ b/include/ndn-cpp/c/interest-types.h
@@ -5,9 +5,9 @@
  */
 
 #ifndef NDN_INTEREST_TYPES_H
-#define	NDN_INTEREST_TYPES_H
+#define NDN_INTEREST_TYPES_H
 
-#ifdef	__cplusplus
+#ifdef __cplusplus
 extern "C" {
 #endif
 
@@ -18,7 +18,7 @@
 
 
 
-#ifdef	__cplusplus
+#ifdef __cplusplus
 }
 #endif