diff --git a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceDelegationLowering.kt b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceDelegationLowering.kt
index 3331488bd57..4151e4c23cb 100644
--- a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceDelegationLowering.kt
+++ b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceDelegationLowering.kt
@@ -19,6 +19,7 @@ package org.jetbrains.kotlin.backend.jvm.lower
 import org.jetbrains.kotlin.backend.common.ClassLoweringPass
 import org.jetbrains.kotlin.backend.common.CodegenUtil
 import org.jetbrains.kotlin.backend.jvm.JvmLoweredStatementOrigin
+import org.jetbrains.kotlin.backend.jvm.codegen.isJvmInterface
 import org.jetbrains.kotlin.backend.jvm.descriptors.DefaultImplsClassDescriptor
 import org.jetbrains.kotlin.backend.jvm.descriptors.DefaultImplsClassDescriptorImpl
 import org.jetbrains.kotlin.codegen.isDefinitelyNotDefaultImplsMethod
@@ -36,19 +37,15 @@ import org.jetbrains.kotlin.ir.expressions.impl.IrReturnImpl
 import org.jetbrains.kotlin.ir.util.createParameterDeclarations
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid
 import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
-import org.jetbrains.kotlin.resolve.DescriptorUtils
 
 
 class InterfaceDelegationLowering(val state: GenerationState) : IrElementTransformerVoid(), ClassLoweringPass {
 
     override fun lower(irClass: IrClass) {
-        val descriptor = irClass.descriptor
-        if (DescriptorUtils.isInterface(descriptor)) {
-            return
-        }
+        if (irClass.isJvmInterface) return
 
         irClass.transformChildrenVoid(this)
-        generateInterfaceMethods(irClass, descriptor)
+        generateInterfaceMethods(irClass, irClass.descriptor)
     }
 
 
diff --git a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceLowering.kt b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceLowering.kt
index 1e7b29ae8c6..3f787f123ce 100644
--- a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceLowering.kt
+++ b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InterfaceLowering.kt
@@ -31,26 +31,23 @@ import org.jetbrains.kotlin.descriptors.impl.SimpleFunctionDescriptorImpl
 import org.jetbrains.kotlin.descriptors.impl.ValueParameterDescriptorImpl
 import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.declarations.IrFunction
-import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
 import org.jetbrains.kotlin.ir.declarations.IrValueParameter
 import org.jetbrains.kotlin.ir.declarations.impl.IrClassImpl
 import org.jetbrains.kotlin.ir.declarations.impl.IrFunctionImpl
 import org.jetbrains.kotlin.ir.symbols.impl.IrSimpleFunctionSymbolImpl
 import org.jetbrains.kotlin.ir.util.createParameterDeclarations
+import org.jetbrains.kotlin.ir.util.isInterface
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid
 import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
 import org.jetbrains.kotlin.load.java.JvmAbi
 import org.jetbrains.kotlin.name.Name
-import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.types.KotlinType
 import org.jetbrains.org.objectweb.asm.Opcodes
 
 class InterfaceLowering(val state: GenerationState) : IrElementTransformerVoid(), ClassLoweringPass {
 
     override fun lower(irClass: IrClass) {
-        if (!DescriptorUtils.isInterface(irClass.descriptor)) {
-            return
-        }
+        if (!irClass.isInterface) return
 
         val interfaceDescriptor = irClass.descriptor
         val defaultImplsDescriptor = createDefaultImplsClassDescriptor(interfaceDescriptor)