diff --git a/esphome/components/usb_host/usb_host.h b/esphome/components/usb_host/usb_host.h
index 99b8437421..f1600aa0cf 100644
--- a/esphome/components/usb_host/usb_host.h
+++ b/esphome/components/usb_host/usb_host.h
@@ -57,7 +57,7 @@ struct TransferRequest {
 };
 
 // Lightweight event types for queue
-enum EventType {
+enum EventType : uint8_t {
   EVENT_DEVICE_NEW,
   EVENT_DEVICE_GONE,
   EVENT_TRANSFER_COMPLETE,
diff --git a/esphome/components/usb_uart/usb_uart.h b/esphome/components/usb_uart/usb_uart.h
index aab36c52b5..0ac710e4c5 100644
--- a/esphome/components/usb_uart/usb_uart.h
+++ b/esphome/components/usb_uart/usb_uart.h
@@ -75,7 +75,7 @@ class RingBuffer {
 struct UsbDataChunk {
   static constexpr size_t MAX_CHUNK_SIZE = 64;  // USB packet size
   uint8_t data[MAX_CHUNK_SIZE];
-  size_t length;
+  uint8_t length;  // Max 64 bytes, so uint8_t is sufficient
   USBUartChannel *channel;
 
   // Required for EventPool - reset to clean state