diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6bf524e6..de05bbc8 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -134,11 +134,11 @@ jobs:
 
             - name: Run iOS unit tests
               working-directory: auth0_flutter/example/ios
-              run: xcodebuild test -scheme Runner -workspace Runner.xcworkspace -destination ${{ join('platform=iOS Simulator,name=', env.simulator) }} -skip-testing:RunnerUITests | xcpretty
+              run: xcodebuild test -scheme Runner -workspace Runner.xcworkspace -destination ${{ format('{0}{1}', 'platform=iOS Simulator,name=', env.simulator) }} -skip-testing:RunnerUITests | xcpretty
 
             - name: Run iOS smoke tests
               working-directory: auth0_flutter/example/ios
-              run: xcodebuild test -scheme Runner -workspace Runner.xcworkspace -destination ${{ join('platform=iOS Simulator,name=', env.simulator) }} -only-testing:RunnerUITests | xcpretty
+              run: xcodebuild test -scheme Runner -workspace Runner.xcworkspace -destination ${{ format('{0}{1}', 'platform=iOS Simulator,name=', env.simulator) }} -only-testing:RunnerUITests | xcpretty
 
             - name: Cancel wokflow on failure
               uses: andymckay/cancel-action@b9280e3f8986d7a8e91c7462efc0fa318010c8b1