diff --git a/src/backend/executor/functions.c b/src/backend/executor/functions.c
index 12214f8a15..ef589278b6 100644
--- a/src/backend/executor/functions.c
+++ b/src/backend/executor/functions.c
@@ -503,7 +503,7 @@ init_execution_state(List *queryTree_list,
 			}
 			else
 				stmt = pg_plan_query(queryTree,
-						  fcache->readonly_func ? CURSOR_OPT_PARALLEL_OK : 0,
+						  			 CURSOR_OPT_PARALLEL_OK,
 									 NULL);
 
 			/*
diff --git a/src/backend/executor/spi.c b/src/backend/executor/spi.c
index 72c7b4d068..eeaa4805e4 100644
--- a/src/backend/executor/spi.c
+++ b/src/backend/executor/spi.c
@@ -314,7 +314,7 @@ SPI_execute(const char *src, bool read_only, long tcount)
 
 	memset(&plan, 0, sizeof(_SPI_plan));
 	plan.magic = _SPI_PLAN_MAGIC;
-	plan.cursor_options = 0;
+	plan.cursor_options = CURSOR_OPT_PARALLEL_OK;
 
 	_SPI_prepare_oneshot_plan(src, &plan);
 
@@ -458,7 +458,7 @@ SPI_execute_with_args(const char *src,
 
 	memset(&plan, 0, sizeof(_SPI_plan));
 	plan.magic = _SPI_PLAN_MAGIC;
-	plan.cursor_options = 0;
+	plan.cursor_options = CURSOR_OPT_PARALLEL_OK;
 	plan.nargs = nargs;
 	plan.argtypes = argtypes;
 	plan.parserSetup = NULL;
diff --git a/src/pl/plpgsql/src/pl_exec.c b/src/pl/plpgsql/src/pl_exec.c
index 8e836a8149..b7d28a6f95 100644
--- a/src/pl/plpgsql/src/pl_exec.c
+++ b/src/pl/plpgsql/src/pl_exec.c
@@ -3627,7 +3627,7 @@ exec_stmt_execsql(PLpgSQL_execstate *estate,
 	{
 		ListCell   *l;
 
-		exec_prepare_plan(estate, expr, 0);
+		exec_prepare_plan(estate, expr, CURSOR_OPT_PARALLEL_OK);
 		stmt->mod_stmt = false;
 		foreach(l, SPI_plan_get_plan_sources(expr->plan))
 		{
@@ -5174,7 +5174,7 @@ exec_eval_expr(PLpgSQL_execstate *estate,
 	 * If first time through, create a plan for this expression.
 	 */
 	if (expr->plan == NULL)
-		exec_prepare_plan(estate, expr, 0);
+		exec_prepare_plan(estate, expr, CURSOR_OPT_PARALLEL_OK);
 
 	/*
 	 * If this is a simple expression, bypass SPI and use the executor