diff --git a/dokka-runners/dokka-gradle-plugin/src/main/kotlin/DokkaBasePlugin.kt b/dokka-runners/dokka-gradle-plugin/src/main/kotlin/DokkaBasePlugin.kt
index 8e44a06d92..40352ea197 100644
--- a/dokka-runners/dokka-gradle-plugin/src/main/kotlin/DokkaBasePlugin.kt
+++ b/dokka-runners/dokka-gradle-plugin/src/main/kotlin/DokkaBasePlugin.kt
@@ -107,6 +107,7 @@ constructor(
 
         dokkaExtension.dokkaGeneratorIsolation.convention(
             dokkaExtension.ProcessIsolation {
+                maxHeapSize.convention("2g")
                 debug.convention(false)
                 jvmArgs.convention(
                     listOf(
diff --git a/dokka-runners/dokka-gradle-plugin/src/testFixtures/kotlin/GradlePropertiesBuilder.kt b/dokka-runners/dokka-gradle-plugin/src/testFixtures/kotlin/GradlePropertiesBuilder.kt
index d0797cf796..5c57cb9afe 100644
--- a/dokka-runners/dokka-gradle-plugin/src/testFixtures/kotlin/GradlePropertiesBuilder.kt
+++ b/dokka-runners/dokka-gradle-plugin/src/testFixtures/kotlin/GradlePropertiesBuilder.kt
@@ -23,7 +23,8 @@ data class GradlePropertiesBuilder(
     /** Gradle specific options. */
     data class GradleArgs(
         var logLevel: LogLevel? = LogLevel.LIFECYCLE,
-        var stacktrace: Boolean? = true,
+        /** Valid values are: `internal`, `all`, `full`. */
+        var stacktrace: String? = "all",
         var debug: Boolean? = null,
         var buildCache: Boolean? = true,
         var buildCacheDebugLog: Boolean? = null,