diff --git a/src/backend/access/gin/ginentrypage.c b/src/backend/access/gin/ginentrypage.c
index 6f4e727b3e..d5aa243a65 100644
--- a/src/backend/access/gin/ginentrypage.c
+++ b/src/backend/access/gin/ginentrypage.c
@@ -87,6 +87,8 @@ GinFormTuple(GinState *ginstate,
 		newsize = Max(newsize, minsize);
 	}
 
+	newsize = SHORTALIGN(newsize);
+
 	GinSetPostingOffset(itup, newsize);
 	GinSetNPosting(itup, nipd);