diff --git a/src/include/utils/relfilenumbermap.h b/src/include/utils/relfilenumbermap.h
index c149a937e92..fa0474a54d7 100644
--- a/src/include/utils/relfilenumbermap.h
+++ b/src/include/utils/relfilenumbermap.h
@@ -13,6 +13,8 @@
 #ifndef RELFILENUMBERMAP_H
 #define RELFILENUMBERMAP_H
 
+#include "common/relpath.h"
+
 extern Oid	RelidByRelfilenumber(Oid reltablespace,
 								 RelFileNumber relfilenumber);