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 58913e61572..f4ddfcee9c0 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
@@ -167,7 +167,7 @@ abstract class Kotlin2JsCompile @Inject constructor(
 
             // Overriding freeArgs from compilerOptions with enhanced one + additional one set on execution phase
             // containing additional arguments based on the js compilation configuration
-            args.freeArgs = executionTimeFreeCompilerArgs ?: enhancedFreeCompilerArgs.get()
+            args.freeArgs = executionTimeFreeCompilerArgs ?: enhancedFreeCompilerArgs.get().toList()
         }
 
         pluginClasspath { args ->