diff --git a/esphome/components/packet_transport/packet_transport.cpp b/esphome/components/packet_transport/packet_transport.cpp
index b6ce24bc1b..8bde4ee505 100644
--- a/esphome/components/packet_transport/packet_transport.cpp
+++ b/esphome/components/packet_transport/packet_transport.cpp
@@ -270,6 +270,7 @@ void PacketTransport::add_binary_data_(uint8_t key, const char *id, bool data) {
   auto len = 1 + 1 + 1 + strlen(id);
   if (len + this->header_.size() + this->data_.size() > this->get_max_packet_size()) {
     this->flush_();
+    this->init_data_();
   }
   add(this->data_, key);
   add(this->data_, (uint8_t) data);
@@ -284,6 +285,7 @@ void PacketTransport::add_data_(uint8_t key, const char *id, uint32_t data) {
   auto len = 4 + 1 + 1 + strlen(id);
   if (len + this->header_.size() + this->data_.size() > this->get_max_packet_size()) {
     this->flush_();
+    this->init_data_();
   }
   add(this->data_, key);
   add(this->data_, data);