diff --git a/src/backend/executor/execUtils.c b/src/backend/executor/execUtils.c
index cc3c5de71eb..a7955e476f9 100644
--- a/src/backend/executor/execUtils.c
+++ b/src/backend/executor/execUtils.c
@@ -321,7 +321,7 @@ CreateExprContext(EState *estate)
 ExprContext *
 CreateWorkExprContext(EState *estate)
 {
-	Size		maxBlockSize = ALLOCSET_DEFAULT_MAXSIZE;
+	Size		maxBlockSize;
 
 	maxBlockSize = pg_prevpower2_size_t(work_mem * (Size) 1024 / 16);