diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index e207ccbb..77630a1d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -72,15 +72,15 @@ jobs:
           # platform-dependent settings - extra board options, board index URLs, skip patterns etc.
           if [[ "${{ contains(matrix.board, 'arduino:avr:mega') }}" == "true" ]]; then
             # Arduino Mega
-            echo "options='cpu=atmega2560'" >> $GITHUB_OUTPUT
+            echo "options=':cpu=atmega2560'" >> $GITHUB_OUTPUT
 
           elif [[ "${{ contains(matrix.board, 'arduino:megaavr:uno2018') }}" == "true" ]]; then
             # Arduino Uno WiFi
-            echo "options='mode=on'" >> $GITHUB_OUTPUT
+            echo "options=':mode=on'" >> $GITHUB_OUTPUT
 
           elif [[ "${{ contains(matrix.board, 'adafruit:samd') }}" == "true" ]]; then
             # Adafruit SAMD
-            echo "options='usbstack=arduino,debug=off'" >> $GITHUB_OUTPUT
+            echo "options=':usbstack=arduino,debug=off'" >> $GITHUB_OUTPUT
             echo "index-url=--additional-urls https://adafruit.github.io/arduino-board-index/package_adafruit_index.json" >> $GITHUB_OUTPUT
 
           elif [[ "${{ contains(matrix.board, 'adafruit:nrf52') }}" == "true" ]]; then
@@ -90,7 +90,7 @@ jobs:
             pip3 install wheel
             pip3 install --user adafruit-nrfutil
             echo "/home/runner/.local/bin" >> $GITHUB_PATH
-            echo "options='softdevice=s132v6,debug=l0'" >> $GITHUB_OUTPUT
+            echo "options=':softdevice=s132v6,debug=l0'" >> $GITHUB_OUTPUT
             echo "index-url=--additional-urls https://adafruit.github.io/arduino-board-index/package_adafruit_index.json" >> $GITHUB_OUTPUT
 
           elif [[ "${{ contains(matrix.board, 'esp32:esp32') }}" == "true" ]]; then
@@ -100,7 +100,7 @@ jobs:
             
           elif [[ "${{ contains(matrix.board, 'esp8266:esp8266') }}" == "true" ]]; then
             # ESP8266
-            echo "options='xtal=80,ResetMethod=ck,CrystalFreq=26,FlashFreq=40,FlashMode=qio,eesz=512K'" >> $GITHUB_OUTPUT
+            echo "options=':xtal=80,ResetMethod=ck,CrystalFreq=26,FlashFreq=40,FlashMode=qio,eesz=512K'" >> $GITHUB_OUTPUT
             echo "index-url=--additional-urls http://arduino.esp8266.com/stable/package_esp8266com_index.json" >> $GITHUB_OUTPUT
 
           elif [[ "${{ contains(matrix.board, 'SparkFun:apollo3') }}" == "true" ]]; then
@@ -119,7 +119,7 @@ jobs:
 
           elif [[ "${{ contains(matrix.board, 'stm32duino:STM32F1') }}" == "true" ]]; then
             # STM32 (unofficial core)
-            echo "options='bootloader_version=original,cpu_speed=speed_72mhz'" >> $GITHUB_OUTPUT
+            echo "options=':bootloader_version=original,cpu_speed=speed_72mhz'" >> $GITHUB_OUTPUT
             echo "index-url=--additional-urls http://dan.drown.org/stm32duino/package_STM32duino_index.json" >> $GITHUB_OUTPUT
 
           elif [[ "${{ contains(matrix.board, 'MegaCoreX:megaavr') }}" == "true" ]]; then
@@ -167,7 +167,7 @@ jobs:
             else
               # build sketch
               echo -e "\n\033[1;33mBuilding ${example##*/} ... \033[0m";
-              arduino-cli compile --libraries /home/runner/work/RadioLib --fqbn ${{ matrix.board }}:${{ steps.prep.outputs.options }} $example --warnings=${{ steps.prep.outputs.warnings }}
+              arduino-cli compile --libraries /home/runner/work/RadioLib --fqbn ${{ matrix.board }}${{ steps.prep.outputs.options }} $example --warnings=${{ steps.prep.outputs.warnings }}
               if [ $? -ne 0 ]; then
                 echo -e "\033[1;31m${example##*/} build FAILED\033[0m\n";
                 exit 1;