diff --git a/.devtools/assemble.sh b/.devtools/assemble.sh
index 58226f4..1607783 100755
--- a/.devtools/assemble.sh
+++ b/.devtools/assemble.sh
@@ -171,6 +171,7 @@ pass "Suggested dependencies installed."
 # deprecation notices.
 # @see https://www.drupal.org/project/drupal/issues/1267246
 if [ "${SYMFONY_DEPRECATIONS_HELPER-}" == "disabled" ]; then
+  note "Disabling deprecation notices in the functional tests."
   echo "error_reporting(E_ALL & ~E_DEPRECATED);" >>build/web/sites/default/default.settings.php
 fi
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7c55874..0640c80 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -108,6 +108,12 @@ jobs:
           php-version: ${{ matrix.php-version }}
           extensions: gd, sqlite, pdo_sqlite
 
+      # Disable Symfony deprecations helper for PHP 8.4+ until minor
+      # versions of Drupal 10 and 11 core fully support PHP 8.4+.
+      # @see https://www.drupal.org/project/drupal/issues/1267246
+      - name: Update SYMFONY_DEPRECATIONS_HELPER for PHP 8.4+
+        run: echo "SYMFONY_DEPRECATIONS_HELPER=$([[ "${{ matrix.php-version }}" < "8.4" ]] && echo 'disabled' || echo '')" >> $GITHUB_ENV
+
       - name: Assemble the codebase
         run: .devtools/assemble.sh
         env:
@@ -145,11 +151,6 @@ jobs:
         run: vendor/bin/phpunit || [ "${CI_TEST_IGNORE_FAILURE:-0}" -eq 1 ]
         env:
           BROWSERTEST_OUTPUT_DIRECTORY: /tmp
-          # Disable Symfony deprecations helper for PHP 8.4+ until minor
-          # versions of Drupal 10 and 11 core fully support PHP 8.4+.
-          # @see https://www.drupal.org/project/drupal/issues/1267246
-          # SYMFONY_DEPRECATIONS_HELPER: ${{ matrix.php-version < '8.4' && 'disabled' }}
-          SYMFONY_DEPRECATIONS_HELPER: 'disabled'
 
       - name: Upload test results as an artifact
         uses: actions/upload-artifact@v4