diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 131863e97..4ed9b46c7 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -55,7 +55,7 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
       - name: Build and run tests
-        run: make run_tests PLATFORM="linux/arm64/v8" ARCH="aarch64"
+        run: make run_tests PLATFORM="linux/arm64/v8" ARCH="aarch64" FFMPEG_ARCH="arm64"
 
   docker_tests_on_amd64:
     runs-on: ubuntu-latest
@@ -67,4 +67,4 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
       - name: Build and run tests
-        run: make run_tests PLATFORM="linux/amd64" ARCH="amd64"
+        run: make run_tests PLATFORM="linux/amd64" ARCH="amd64" FFMPEG_ARCH="amd64"