diff --git a/.github/workflows/ci_cortex_m4.yml b/.github/workflows/ci_cortex_m4.yml
index e5ae4c1f..8febdae5 100644
--- a/.github/workflows/ci_cortex_m4.yml
+++ b/.github/workflows/ci_cortex_m4.yml
@@ -59,8 +59,12 @@ jobs:
     # Prepare the build system
     - name: Prepare build system
       run: cmake -Bbuild -DCMAKE_TOOLCHAIN_FILE=./cmake/cortex_m4.cmake -GNinja .
+      env:
+        PATH: "$HOME/arm-none-eabi-gcc-9-2019-q4/bin:$PATH"
 
     - name: Compile and link
       run: cmake --build ./build
+      env:
+        PATH: "$HOME/arm-none-eabi-gcc-9-2019-q4/bin:$PATH"