diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanLoweringPhases.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanLoweringPhases.kt
index df45319f809..cab123428dd 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanLoweringPhases.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanLoweringPhases.kt
@@ -239,18 +239,11 @@ internal val callableReferencePhase = makeKonanFileLoweringPhase(
         prerequisite = setOf(delegationPhase) // TODO: make weak dependency on `testProcessorPhase`
 )
 
-internal val interopPart1Phase = makeKonanFileLoweringPhase(
-        ::InteropLoweringPart1,
-        name = "InteropPart1",
-        description = "Interop lowering, part 1",
-        prerequisite = setOf(inlinePhase)
-)
-
-internal val interopPart2Phase = makeKonanFileLoweringPhase(
-        ::InteropLoweringPart2,
-        name = "InteropPart2",
-        description = "Interop lowering, part 2",
-        prerequisite = setOf(localFunctionsPhase)
+internal val interopPhase = makeKonanFileLoweringPhase(
+        ::InteropLowering,
+        name = "Interop",
+        description = "Interop lowering",
+        prerequisite = setOf(inlinePhase, localFunctionsPhase)
 )
 
 internal val varargPhase = makeKonanFileLoweringPhase(
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ToplevelPhases.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ToplevelPhases.kt
index 0fdac1d120c..c93ad249c81 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ToplevelPhases.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ToplevelPhases.kt
@@ -335,8 +335,7 @@ internal val allLoweringsPhase = namedIrModulePhase(
                                 enumClassPhase then
                                 delegationPhase then
                                 callableReferencePhase then
-                                interopPart1Phase then
-                                interopPart2Phase then
+                                interopPhase then
                                 varargPhase then
                                 compileTimeEvaluatePhase then
                                 coroutinesPhase then
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InteropLowering.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InteropLowering.kt
index 3510780f9ab..3511cdce7f4 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InteropLowering.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InteropLowering.kt
@@ -50,7 +50,18 @@ import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
 import org.jetbrains.kotlin.resolve.descriptorUtil.module
 
-internal abstract class BaseInteropIrTransformer(private val context: Context) : IrBuildingTransformer(context) {
+internal class InteropLowering(context: Context) : FileLoweringPass {
+    // TODO: merge these lowerings.
+    private val part1 = InteropLoweringPart1(context)
+    private val part2 = InteropLoweringPart2(context)
+
+    override fun lower(irFile: IrFile) {
+        part1.lower(irFile)
+        part2.lower(irFile)
+    }
+}
+
+private abstract class BaseInteropIrTransformer(private val context: Context) : IrBuildingTransformer(context) {
 
     protected inline fun <T> generateWithStubs(element: IrElement? = null, block: KotlinStubs.() -> T): T =
             createKotlinStubs(element).block()
@@ -105,7 +116,7 @@ internal abstract class BaseInteropIrTransformer(private val context: Context) :
     protected abstract fun addTopLevel(declaration: IrDeclaration)
 }
 
-internal class InteropLoweringPart1(val context: Context) : BaseInteropIrTransformer(context), FileLoweringPass {
+private class InteropLoweringPart1(val context: Context) : BaseInteropIrTransformer(context), FileLoweringPass {
 
     private val symbols get() = context.ir.symbols
 
@@ -799,7 +810,7 @@ internal class InteropLoweringPart1(val context: Context) : BaseInteropIrTransfo
 /**
  * Lowers some interop intrinsic calls.
  */
-internal class InteropLoweringPart2(val context: Context) : FileLoweringPass {
+private class InteropLoweringPart2(val context: Context) : FileLoweringPass {
     override fun lower(irFile: IrFile) {
         val transformer = InteropTransformer(context, irFile)
         irFile.transformChildrenVoid(transformer)