diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index 7dab96c1be0..77a7a868ca3 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -3520,7 +3520,7 @@ _outTableSampleClause(StringInfo str, const TableSampleClause *node)
 static void
 _outA_Expr(StringInfo str, const A_Expr *node)
 {
-	WRITE_NODE_TYPE("AEXPR");
+	WRITE_NODE_TYPE("A_EXPR");
 
 	switch (node->kind)
 	{