diff --git a/ndn-cpp/c/util/ndn_memory.h b/ndn-cpp/c/util/ndn_memory.h
index 00202a6..b40f9ef 100644
--- a/ndn-cpp/c/util/ndn_memory.h
+++ b/ndn-cpp/c/util/ndn_memory.h
@@ -8,11 +8,11 @@
  */
 
 #ifndef NDN_MEMORY_H
-#define	NDN_MEMORY_H
+#define NDN_MEMORY_H
 
 #include "../../../config.h"
 
-#ifdef	__cplusplus
+#ifdef __cplusplus
 extern "C" {
 #endif
 
@@ -55,7 +55,7 @@
 void ndn_memset(unsigned char *dest, int val, unsigned int len);
 #endif
 
-#ifdef	__cplusplus
+#ifdef __cplusplus
 }
 #endif
 
diff --git a/ndn-cpp/c/util/ndn_realloc.h b/ndn-cpp/c/util/ndn_realloc.h
index db9470d..bca997a 100644
--- a/ndn-cpp/c/util/ndn_realloc.h
+++ b/ndn-cpp/c/util/ndn_realloc.h
@@ -4,9 +4,9 @@
  */
 
 #ifndef NDN_NDN_REALLOC_H
-#define	NDN_NDN_REALLOC_H
+#define NDN_NDN_REALLOC_H
 
-#ifdef	__cplusplus
+#ifdef __cplusplus
 extern "C" {
 #endif
 
@@ -19,7 +19,7 @@
  */
 unsigned char *ndn_realloc(unsigned char *array, unsigned int length);
 
-#ifdef	__cplusplus
+#ifdef __cplusplus
 }
 #endif