diff --git a/src/backend/Makefile b/src/backend/Makefile
index 4ac9f8f180..5c4772298d 100644
--- a/src/backend/Makefile
+++ b/src/backend/Makefile
@@ -306,6 +306,7 @@ maintainer-clean: distclean
 	      storage/lmgr/lwlocknames.c \
 	      storage/lmgr/lwlocknames.h \
 	      utils/adt/jsonpath_gram.c \
+	      utils/adt/jsonpath_gram.h \
 	      utils/adt/jsonpath_scan.c \
 	      utils/misc/guc-file.c