diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2ee9928de2c..aa5224a27fd 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -8560,8 +8560,13 @@ get_variable(Var *var, int levelsup, bool istoplevel, deparse_context *context)
 		attname = get_rte_attribute_name(rte, attnum);
 	}
 
-	need_prefix = (context->varprefix || attname == NULL ||
-				   var->varreturningtype != VAR_RETURNING_DEFAULT);
+	/*
+	 * Vars in DEFINE clause never need table-name prefix.
+	 */
+	need_prefix = false;
+	if (!context->inRPRDefine)
+		need_prefix = (context->varprefix || attname == NULL ||
+					   var->varreturningtype != VAR_RETURNING_DEFAULT);
 
 	/*
 	 * If we're considering a plain Var in an ORDER BY (but not GROUP BY)