diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/pm20/LegacyMappedVariant.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/pm20/LegacyMappedVariant.kt
index 5c3d033d4d1..a29fe20e643 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/pm20/LegacyMappedVariant.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/pm20/LegacyMappedVariant.kt
@@ -31,6 +31,8 @@ import org.jetbrains.kotlin.project.model.KotlinModuleFragment
 internal open class LegacyMappedVariant(
     internal val compilation: KotlinCompilation<*>,
 ) : KotlinGradleVariant {
+    override fun toString(): String = "variant mapped to $compilation"
+
     private val fragmentForDefaultSourceSet =
         (compilation.defaultSourceSet as FragmentMappedKotlinSourceSet).underlyingFragment