diff --git a/conf/google.config b/conf/google.config
index 41f0e1f..6e8a45a 100644
--- a/conf/google.config
+++ b/conf/google.config
@@ -19,4 +19,6 @@ google.lifeSciences.preemptible = params.google_preemptible
 if (google.lifeSciences.preemptible) {
   process.errorStrategy = { task.exitStatus in [8,10,14] ? 'retry' : 'terminate' }
   process.maxRetries = 5
-}
\ No newline at end of file
+}
+
+process.machineType = { task.memory > task.cpus * 6.GB ? ['custom', task.cpus, task.cpus * 6656].join('-') : null }