diff --git a/esphome/components/packet_interface/layers/basic_fragmentation.py b/esphome/components/packet_interface/layers/basic_fragmentation.py
index 06826520b05..7440ae38765 100644
--- a/esphome/components/packet_interface/layers/basic_fragmentation.py
+++ b/esphome/components/packet_interface/layers/basic_fragmentation.py
@@ -1,6 +1,7 @@
 """Fragmentation layer that splits packets larger than the layers below allow, and joins them again."""
 
 import esphome.codegen as cg
+from esphome.components.const import CONF_MAX_PACKET_SIZE
 import esphome.config_validation as cv
 from esphome.const import CONF_ID
 from esphome.cpp_generator import MockObj
@@ -8,8 +9,6 @@ from esphome.types import ConfigType
 
 from . import FRAGMENTATION, PacketInterface, packet_interface_ns
 
-CONF_MAX_PACKET_SIZE = "max_packet_size"
-
 BasicFragmentation = packet_interface_ns.class_("BasicFragmentation", PacketInterface)
 
 BASIC_FRAGMENTATION_SCHEMA = cv.Schema(