Secure properties / signing apk doesn't work with Gradle

I’m using gradle to build my app. I’m trying to set up signing of the apk so I can upload it. I created a properties file with the alias, password, and reference to my keystore file just like I did when using ant. The generated nsight_tegra_build.gradle file in the ReleaseTegra-Android\build directory correctly has the data from the file.

However, the build process is looking in the ReleaseTegra-Android\build directory for the .keystore file. The .keystore file is in the root directory. How do I fix the build process so it looks for the .keystore file in the correct directory.