diff --git a/.github/workflows/compile-examples.yml b/.github/workflows/compile-examples.yml
index 660cc538..85004836 100644
--- a/.github/workflows/compile-examples.yml
+++ b/.github/workflows/compile-examples.yml
@@ -39,6 +39,12 @@ jobs:
             platforms: |
               - name: rp2040:rp2040
                 source-url: https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
+          - fqbn: arduino:renesas_portenta:portenta_c33
+            platforms: |
+              - name: arduino:renesas_portenta
+          - fqbn: arduino:renesas_uno:minima
+            platforms: |
+              - name: arduino:renesas_uno
 
     steps:
       - name: Checkout
diff --git a/README.md b/README.md
index 93687d7c..7464be52 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,10 @@ This library works for
 ```bash
 arduino-cli compile -b rp2040:rp2040:rpipico -v examples/OpenCyphal-Heartbeat-Publisher -u -p /dev/ttyACM0
 ```
+* [ArduinoCore-renesas](https://github.com/arduino/ArduinoCore-renesas): [`Portenta C33`](https://store.arduino.cc/products/portenta-c33), [`Uno R4 WiFi`](https://store.arduino.cc/products/uno-r4-wifi), [`Uno R4 Minima`](https://store.arduino.cc/products/uno-r4-minima), ... :heavy_check_mark:
+```bash
+arduino-cli compile -b arduino:renesas_portenta:portenta_c33 -v examples/OpenCyphal-Heartbeat-Publisher -u -p /dev/ttyACM0
+```
 * **Host** (x86/x64/...): Using the CMake build system this library can be cross-compiled to a static C++ library and linked against any C++ executable. This is possible because the code itself is pure C/C++ without and dependencies to the Arduino framework.
 ```bash
 git clone https://github.com/107-systems/107-Arduino-Cyphal && cd 107-Arduino-Cyphal
diff --git a/library.properties b/library.properties
index ccab7624..2d29e5d7 100644
--- a/library.properties
+++ b/library.properties
@@ -6,6 +6,6 @@ sentence=Arduino library for providing a convenient C++ interface for accessing
 paragraph=
 category=Communication
 url=https://github.com/107-systems/107-Arduino-Cyphal
-architectures=rp2040
+architectures=rp2040,renesas_portenta,renesas_uno
 includes=107-Arduino-Cyphal.h
 depends=
diff --git a/src/util/registry/registry_value.hpp b/src/util/registry/registry_value.hpp
index 13dfeaf2..3b322bf4 100644
--- a/src/util/registry/registry_value.hpp
+++ b/src/util/registry/registry_value.hpp
@@ -7,7 +7,6 @@
 
 #pragma once
 
-#include <span>
 #include <array>
 #include <cstdint>
 #include <cstring>