diff --git a/src/backend/optimizer/util/clauses.c b/src/backend/optimizer/util/clauses.c
index f4446169f5..117efbf7de 100644
--- a/src/backend/optimizer/util/clauses.c
+++ b/src/backend/optimizer/util/clauses.c
@@ -3378,6 +3378,7 @@ eval_const_expressions_mutator(Node *node,
 		case T_ArrayRef:
 		case T_ArrayExpr:
 		case T_RowExpr:
+		case T_MinMaxExpr:
 			{
 				/*
 				 * Generic handling for node types whose own processing is