diff --git a/src/hnswscan.c b/src/hnswscan.c
index ce0c2f3..969c04a 100644
--- a/src/hnswscan.c
+++ b/src/hnswscan.c
@@ -1,6 +1,7 @@
 #include "postgres.h"
 
 #include "access/relscan.h"
+#include "catalog/pg_type_d.h"
 #include "hnsw.h"
 #include "pgstat.h"
 #include "storage/bufmgr.h"