diff --git a/build.gradle b/build.gradle
index 80b4c80..dc90666 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1436,7 +1436,7 @@
     def userDefinedCoresPerFork = System.getenv('R8_GRADLE_CORES_PER_FORK')
     def coresPerFork = userDefinedCoresPerFork ? userDefinedCoresPerFork.toInteger() : 3
     // See https://docs.gradle.org/current/dsl/org.gradle.api.tasks.testing.Test.html.
-    maxParallelForks = Runtime.runtime.availableProcessors().intdiv(coresPerFork) ?: 1
+    maxParallelForks = (Runtime.runtime.availableProcessors().intdiv(coresPerFork) ?: 1) + 1
     println("NOTE: Max parallel forks " + maxParallelForks)
     forkEvery = 0
     if (project.hasProperty('disable_assertions')) {