diff --git a/idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/Weighers.kt b/idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/Weighers.kt
index f6ebbe5ed91..4abed12ea1c 100644
--- a/idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/Weighers.kt
+++ b/idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/Weighers.kt
@@ -161,7 +161,7 @@ object CallableWeigher : LookupElementWeigher("kotlin.callableWeight") {
         other
     }
 
-    private class CompoundWeight(val weight1: Weight1, val receiverIndex: Int, val weight2: Weight2) : Comparable<CompoundWeight> {
+    private data class CompoundWeight(val weight1: Weight1, val receiverIndex: Int, val weight2: Weight2) : Comparable<CompoundWeight> {
         override fun compareTo(other: CompoundWeight): Int {
             if (weight1 != other.weight1) return weight1.compareTo(other.weight1)
             if (receiverIndex != other.receiverIndex) return receiverIndex.compareTo(other.receiverIndex)