diff --git a/native/commonizer/src/org/jetbrains/kotlin/descriptors/commonizer/builder/builderUtils.kt b/native/commonizer/src/org/jetbrains/kotlin/descriptors/commonizer/builder/builderUtils.kt
index a362ea2e976..3adbaadff8e 100644
--- a/native/commonizer/src/org/jetbrains/kotlin/descriptors/commonizer/builder/builderUtils.kt
+++ b/native/commonizer/src/org/jetbrains/kotlin/descriptors/commonizer/builder/builderUtils.kt
@@ -131,7 +131,7 @@ internal fun CirSimpleType.buildType(
     )
 
     return if (classifier is TypeAliasDescriptor)
-        classifier.underlyingType.withAbbreviation(simpleType)
+        classifier.underlyingType.makeNullableAsSpecified(simpleType.isMarkedNullable).withAbbreviation(simpleType)
     else
         simpleType
 }