diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f4b1da6..d64be55 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -31,9 +31,9 @@ jobs:
     - name: Install STM32 core
       run: arduino-cli core install STMicroelectronics:stm32 --additional-urls https://github.com/stm32duino/BoardManagerFiles/raw/main/package_stmicroelectronics_index.json
     - name: Build firmware for STM32F4
-      run: make BOARD=STMicroelectronics:stm32:GenF4 EXTRA='--build-property compiler.cpp.extra_flags=-DENABLE_HWSERIAL1'
+      run: make BOARD=STMicroelectronics:stm32:GenF4:usb=CDCgen EXTRA='--build-property compiler.cpp.extra_flags=-DENABLE_HWSERIAL1'
     - name: Build firmware for STM32H7
-      run: make BOARD=STMicroelectronics:stm32:GenH7 EXTRA='--build-property compiler.cpp.extra_flags=-DENABLE_HWSERIAL1'
+      run: make BOARD=STMicroelectronics:stm32:GenH7:usb=CDCgen EXTRA='--build-property compiler.cpp.extra_flags=-DENABLE_HWSERIAL1'
     - name: Upload binaries
       uses: actions/upload-artifact@v7
       with: