diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/DefaultArgumentStubGenerator.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/DefaultArgumentStubGenerator.kt
index 2ea34ffc5b0..886b2fbd855 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/DefaultArgumentStubGenerator.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/DefaultArgumentStubGenerator.kt
@@ -57,7 +57,7 @@ open class DefaultArgumentStubGenerator(
         val newIrFunction =
             irFunction.generateDefaultsFunction(context, skipInlineMethods, skipExternalMethods, forceSetOverrideSymbols, visibility)
                 ?: return null
-        if (newIrFunction.origin == IrDeclarationOrigin.FAKE_OVERRIDE) {
+        if (newIrFunction.isFakeOverride) {
             return listOf(irFunction, newIrFunction)
         }
 
diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/LateinitLowering.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/LateinitLowering.kt
index 2ba29d109c2..8becd7a0215 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/LateinitLowering.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/LateinitLowering.kt
@@ -213,4 +213,4 @@ private fun CommonBackendContext.buildOrGetNullableField(originalField: IrField)
     }
 }
 
-private val IrProperty.isRealLateinit get() = isLateinit && origin != IrDeclarationOrigin.FAKE_OVERRIDE
\ No newline at end of file
+private val IrProperty.isRealLateinit get() = isLateinit && getter?.isFakeOverride != true
\ No newline at end of file