diff --git a/compiler/backend/src/org/jetbrains/kotlin/codegen/AccessorForCallableDescriptor.java b/compiler/backend/src/org/jetbrains/kotlin/codegen/AccessorForCallableDescriptor.kt
similarity index 64%
rename from compiler/backend/src/org/jetbrains/kotlin/codegen/AccessorForCallableDescriptor.java
rename to compiler/backend/src/org/jetbrains/kotlin/codegen/AccessorForCallableDescriptor.kt
index d40c5740c0f..c347de3e3c3 100644
--- a/compiler/backend/src/org/jetbrains/kotlin/codegen/AccessorForCallableDescriptor.java
+++ b/compiler/backend/src/org/jetbrains/kotlin/codegen/AccessorForCallableDescriptor.kt
@@ -14,17 +14,14 @@
  * limitations under the License.
  */
 
-package org.jetbrains.kotlin.codegen;
+package org.jetbrains.kotlin.codegen
 
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-import org.jetbrains.kotlin.descriptors.CallableMemberDescriptor;
-import org.jetbrains.kotlin.descriptors.ClassDescriptor;
+import org.jetbrains.kotlin.descriptors.CallableMemberDescriptor
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
 
-public interface AccessorForCallableDescriptor<T extends CallableMemberDescriptor> {
-    @NotNull
-    T getCalleeDescriptor();
+interface AccessorForCallableDescriptor<T : CallableMemberDescriptor> {
+    val calleeDescriptor: T
+
+    val superCallTarget: ClassDescriptor?
 
-    @Nullable
-    ClassDescriptor getSuperCallTarget();
 }