diff --git a/src/pl/plpgsql/src/pl_exec.c b/src/pl/plpgsql/src/pl_exec.c
index e8205275036..9c41ca08253 100644
--- a/src/pl/plpgsql/src/pl_exec.c
+++ b/src/pl/plpgsql/src/pl_exec.c
@@ -8306,8 +8306,7 @@ exec_save_simple_expr(PLpgSQL_expr *expr, CachedPlan *cplan)
 	 * might've stuck a Material node atop it.  The simplest way to deal with
 	 * this is to look through the Gather and/or Material nodes.  The upper
 	 * node's tlist would normally contain a Var referencing the child node's
-	 * output, but it could also be a Param, or it could be a Const that
-	 * setrefs.c copied as-is.
+	 * output ... but setrefs.c might also have copied a Const as-is.
 	 */
 	plan = stmt->planTree;
 	for (;;)
@@ -8334,9 +8333,9 @@ exec_save_simple_expr(PLpgSQL_expr *expr, CachedPlan *cplan)
 			/* If setrefs.c copied up a Const, no need to look further */
 			if (IsA(tle_expr, Const))
 				break;
-			/* Otherwise, it had better be a Param or an outer Var */
-			Assert(IsA(tle_expr, Param) || (IsA(tle_expr, Var) &&
-											((Var *) tle_expr)->varno == OUTER_VAR));
+			/* Otherwise, it better be an outer Var */
+			Assert(IsA(tle_expr, Var));
+			Assert(((Var *) tle_expr)->varno == OUTER_VAR);
 			/* Descend to the child node */
 			plan = plan->lefttree;
 		}