diff --git a/libraries/tools/kotlin-gradle-plugin-idea/src/main/kotlin/org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinFragmentDependency.kt b/libraries/tools/kotlin-gradle-plugin-idea/src/main/kotlin/org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinFragmentDependency.kt
index a6dd6103f9a..21dd2bebd7a 100644
--- a/libraries/tools/kotlin-gradle-plugin-idea/src/main/kotlin/org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinFragmentDependency.kt
+++ b/libraries/tools/kotlin-gradle-plugin-idea/src/main/kotlin/org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinFragmentDependency.kt
@@ -12,6 +12,8 @@ interface IdeaKotlinFragmentDependency : Serializable
 @Suppress("unused")
 @InternalKotlinGradlePluginApi
 class IdeaKotlinFragmentDependencyImpl: IdeaKotlinFragmentDependency {
+
+    @InternalKotlinGradlePluginApi
     companion object {
         const val serialVersionUID = 0L
     }