diff --git a/libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/tasks/Kotlin2JsCompile.kt b/libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/tasks/Kotlin2JsCompile.kt
index 73dc9a50446..60cca530ff7 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/tasks/Kotlin2JsCompile.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/tasks/Kotlin2JsCompile.kt
@@ -292,7 +292,7 @@ abstract class Kotlin2JsCompile @Inject constructor(
 
     }
 
-    open fun contributeAdditionalCompilerArguments(context: ContributeCompilerArgumentsContext<K2JSCompilerArguments>) = Unit
+    protected open fun contributeAdditionalCompilerArguments(context: ContributeCompilerArgumentsContext<K2JSCompilerArguments>) = Unit
 
     override fun callCompilerAsync(
         args: K2JSCompilerArguments,