diff --git a/native/commonizer/src/org/jetbrains/kotlin/commonizer/metadata/utils/MetadataDeclarationsComparator.kt b/native/commonizer/src/org/jetbrains/kotlin/commonizer/metadata/utils/MetadataDeclarationsComparator.kt
index 201a0c42b6f..dfe42f02602 100644
--- a/native/commonizer/src/org/jetbrains/kotlin/commonizer/metadata/utils/MetadataDeclarationsComparator.kt
+++ b/native/commonizer/src/org/jetbrains/kotlin/commonizer/metadata/utils/MetadataDeclarationsComparator.kt
@@ -1216,6 +1216,8 @@ class MetadataDeclarationsComparator private constructor(private val config: Con
 
         private fun KmType.dumpToString(dumpExtras: Boolean): String = buildString {
             append(classifier.dumpToString(dumpClassifierType = false))
+            if (isNullable) append("?")
+            if (isDefinitelyNonNull) append("!!")
             if (arguments.isNotEmpty()) {
                 arguments.joinTo(this, prefix = "<", postfix = ">") { argument ->
                     argument.dumpToString(dumpExtras = false)