diff --git a/contrib/btree_gist/btree_gist.sql.in b/contrib/btree_gist/btree_gist.sql.in
index 3cad6354442fcbeb642177ff622131c3d507c82e..f7e6af0716cdfb8b5b3fc487dff4f1c97b24f71f 100644
--- a/contrib/btree_gist/btree_gist.sql.in
+++ b/contrib/btree_gist/btree_gist.sql.in
@@ -778,7 +778,7 @@ AS
 	FUNCTION	5	gbt_cash_penalty (internal, internal, internal),
 	FUNCTION	6	gbt_cash_picksplit (internal, internal),
 	FUNCTION	7	gbt_cash_same (internal, internal, internal),
-	STORAGE		gbtreekey8;
+	STORAGE		gbtreekey16;
 
 --
 --