diff --git a/compiler/testData/codegen/box/traits/kt3579.kt b/compiler/testData/codegen/box/traits/kt3579.kt
index 5f1d151d85e..64514c50d9b 100644
--- a/compiler/testData/codegen/box/traits/kt3579.kt
+++ b/compiler/testData/codegen/box/traits/kt3579.kt
@@ -1,5 +1,5 @@
 open class Persistent(val p: String)
-trait Hierarchy<T: Persistent > where T : Hierarchy<T>
+interface Hierarchy<T: Persistent > where T : Hierarchy<T>
 
 class Location(): Persistent("OK"), Hierarchy<Location>
 
diff --git a/compiler/testData/codegen/box/traits/kt3579_2.kt b/compiler/testData/codegen/box/traits/kt3579_2.kt
index a03d0c46823..10e9a962302 100644
--- a/compiler/testData/codegen/box/traits/kt3579_2.kt
+++ b/compiler/testData/codegen/box/traits/kt3579_2.kt
@@ -1,9 +1,9 @@
-trait First
-trait Some<T: First> where T : Some<T>
+interface First
+interface Some<T : First> where T : Some<T>
 
 val a: Some<*>? = null
 
-class MClass(val p: String): First, Some<MClass>
+class MClass(val p: String) : First, Some<MClass>
 
 fun box(): String {
     return MClass("OK").p