diff --git a/CHANGELOG.md b/CHANGELOG.md
index 70bab64..08981c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Fixed compiling multi-file projects with implicit namespace packages.
+- Fixed EV3 firmware upload on Windows ([pybricksdev#128]).
+
+[pybricksdev#128]: https://github.com/pybricks/pybricksdev/pull/128
 
 ## [2.3.0] - 2025-10-31
 
diff --git a/pybricksdev/connections/ev3.py b/pybricksdev/connections/ev3.py
index 9c4e2ac..a8e899f 100644
--- a/pybricksdev/connections/ev3.py
+++ b/pybricksdev/connections/ev3.py
@@ -84,10 +84,17 @@ def _send_command(self, command: Command, payload: bytes | None = None) -> int:
 
             length += len(payload)
 
+        # report_id is not used by the EV3 but is required by HIDAPI on Windows.
+        # It does no harm on Linux, so we include it unconditionally. Note that
+        # the report ID is automatically stripped from incoming messages by
+        # HIDAPI on all platforms.
+        report_id = 0
+
         message_number = next(self._msg_count)
 
         message = struct.pack(
-            "<HHBB",
+            "<BHHBB",
+            report_id,
             length,
             message_number,
             MessageType.SYSTEM_COMMAND_REPLY,