diff --git a/src/tag_internal.h b/src/tag_internal.h
index b4b928e60..af05cc6b6 100644
--- a/src/tag_internal.h
+++ b/src/tag_internal.h
@@ -20,6 +20,8 @@
 #ifndef MPD_TAG_INTERNAL_H
 #define MPD_TAG_INTERNAL_H
 
+#include "tag.h"
+
 #include <stdbool.h>
 
 extern bool ignore_tag_items[TAG_NUM_OF_ITEM_TYPES];