diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5427a32..ac948b6 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -35,7 +35,7 @@ jobs:
         run: |
           cd ./firmware/build
           rm -rf -- ..?* .[!.]* *
-          export CXXFLAGS="-D_BASE_VIDEO_MODE=1
+          export CXXFLAGS="-D_BASE_VIDEO_MODE=1"
           cmake .. -G Ninja -DPICO_SDK_PATH=../../pico-sdk
           ninja
       - name: 'Upload base video mode artifacts'