diff --git a/libavcodec/atrac9tab.h b/libavcodec/atrac9tab.h
index adb10fb027..f245656fd9 100644
--- a/libavcodec/atrac9tab.h
+++ b/libavcodec/atrac9tab.h
@@ -19,6 +19,9 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#ifndef AVCODEC_ATRAC9TAB_H
+#define AVCODEC_ATRAC9TAB_H
+
 #include <stdint.h>
 
 enum ATRAC9BlockType {
@@ -1624,3 +1627,5 @@ static const HuffmanCodebook at9_huffman_coeffs[][8][4] = {
         },
     },
 };
+
+#endif /* AVCODEC_ATRAC9TAB_H */