diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/EnumWhenLowering.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/EnumWhenLowering.kt
index 2f33595e91d..944998f8325 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/EnumWhenLowering.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/EnumWhenLowering.kt
@@ -26,7 +26,7 @@ open class EnumWhenLowering(protected val context: CommonBackendContext) : IrEle
     private val subjectWithOrdinalStack = mutableListOf<Pair<IrVariable, Lazy<IrVariable>>>()
 
     protected open fun mapConstEnumEntry(entry: IrEnumEntry): Int =
-        entry.parentAsClass.declarations.filterIsInstance<IrEnumEntry>().indexOf(this as IrEnumEntry).also {
+        entry.parentAsClass.declarations.filterIsInstance<IrEnumEntry>().indexOf(entry).also {
             assert(it >= 0) { "enum entry ${entry.dump()} not in parent class" }
         }