diff --git a/atsc/atsc.h b/atsc/atsc.h
index 00a34c8..0164218 100644
--- a/atsc/atsc.h
+++ b/atsc/atsc.h
@@ -18,8 +18,8 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
  *****************************************************************************/
 
-#ifndef LIBMPEGTS_ATSC
-#define LIBMPEGTS_ATSC
+#ifndef LIBMPEGTS_ATSC_H
+#define LIBMPEGTS_ATSC_H
 
 /* ATSC stream_types */
 #define AUDIO_AC3         0x81
diff --git a/crc/crc.h b/crc/crc.h
index 08157d0..1140904 100644
--- a/crc/crc.h
+++ b/crc/crc.h
@@ -18,8 +18,8 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
  *****************************************************************************/
 
-#ifndef LIBMPEGTS_CRC32
-#define LIBMPEGTS_CRC32
+#ifndef LIBMPEGTS_CRC_H
+#define LIBMPEGTS_CRC_H
 
 uint32_t crc_32( uint8_t *bytes, int length );
 
diff --git a/isdb/isdb.h b/isdb/isdb.h
index 3407941..cff7069 100644
--- a/isdb/isdb.h
+++ b/isdb/isdb.h
@@ -18,7 +18,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
  *****************************************************************************/
 
-#ifndef LIBMPEGTS_ISDB
-#define LIBMPEGTS_ISDB
+#ifndef LIBMPEGTS_ISDB_H
+#define LIBMPEGTS_ISDB_H
 
 #endif