diff --git a/.github/workflows/ios_manual.yml b/.github/workflows/ios_manual.yml
index 0371092..e5dced2 100644
--- a/.github/workflows/ios_manual.yml
+++ b/.github/workflows/ios_manual.yml
@@ -52,8 +52,16 @@ jobs:
           cd firefox-ios
           brew update
           pip3 install virtualenv pipenv
+      - name: Check if cache loaded correctly
+        id: check_cache
+        run: |
+          if [ -d /Users/runner/Library/Developer/Xcode/DerivedData/Client-*/ ]; then
+            echo "::set-output name=cache_loaded::true"
+          else
+            echo "::set-output name=cache_loaded::false"
+          fi
       - name: Build app
-        if: ${{ ! test /Users/runner/Library/Developer/Xcode/DerivedData/Client-*/ }}
+        if: steps.check_cache.outputs.cache_loaded == 'false'
         run: |
           cd firefox-ios
           xcodebuild build-for-testing -project Client.xcodeproj -scheme Fennec -configuration Fennec -sdk iphonesimulator -quiet -destination 'platform=iOS Simulator,name=iPhone 15,OS=17.2'