UI Automator in project with minSdkVersion 9

im trying to use UI Automator in my project with minSdkVersion 9 and of course it not work because it target API 18.

So Android Studio throws me this error:

Error:(5, 5) uses-sdk:minSdkVersion 9 cannot be smaller than version 18 declared in library ~/app/build/intermediates/exploded-aar/com.android.support.test.uiautomator/uiautomator-v18/2.1.1/AndroidManifest.xml

Suggestion: use tools:overrideLibrary="android.support.test.uiautomator.v18" to force usage

Error:Execution failed for task ':app:processDebugAndroidTestManifest'.
> java.lang.RuntimeException: Manifest merger failed : uses-sdk:minSdkVersion 9 cannot be smaller than version 18 declared in library ~/app/build/intermediates/exploded-aar/com.android.support.test.uiautomator/uiautomator-v18/2.1.1/AndroidManifest.xml

    Suggestion: use tools:overrideLibrary="android.support.test.uiautomator.v18" to force usage

I added to my Manifest the tag <uses-sdk tools:overrideLibrary="android.support.test.uiautomator.v18" /> but the error keep showing, i am doing something wrong?