diff --git a/.github/workflows/build_firmware.yml b/.github/workflows/build_firmware.yml
index c7ef3e37d..40a47f1ea 100644
--- a/.github/workflows/build_firmware.yml
+++ b/.github/workflows/build_firmware.yml
@@ -22,7 +22,7 @@ jobs:
         pip install --upgrade platformio
     - name: Build for Arduino UNO
       run: |
-        platformio run --environment uno
+        platformio run --environment uno-avr
         mkdir -p build
         mv .pio/build/uno/firmware.hex build/ayab_monolithic_uno.hex
     - name: Cache build asset
diff --git a/platformio.ini b/platformio.ini
index 720ed8bd6..5eee9080b 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -9,11 +9,19 @@
 ; https://docs.platformio.org/page/projectconf.html
 
 [platformio]
-default_envs = uno
+default_envs = uno-avr
 
 [env]
 framework = arduino
 
-[env:uno]
+[env:uno-avr]
 platform = atmelavr
 board = uno
+
+[env:uno-r4-minima]
+platform = renesas-ra
+board = uno_r4_minima
+
+[env:uno-r4-wifi]
+platform = renesas-ra
+board = uno_r4_wifi
\ No newline at end of file
diff --git a/src/ayab/board.h b/src/ayab/board.h
index 8a4d286e0..d29919b37 100644
--- a/src/ayab/board.h
+++ b/src/ayab/board.h
@@ -54,7 +54,7 @@ constexpr uint16_t START_KNITTING_DELAY = 2000U;
 #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega328P__)
 // Arduino Uno
 #else
-#error "untested board"
+#warning "untested board"
 #endif
 
 #endif // BOARD_H_