diff --git a/native/commonizer/testData/classifierCommonization/typeAliases/commonized/common/package_kotlinx_cinterop.kt b/native/commonizer/testData/classifierCommonization/typeAliases/commonized/common/package_kotlinx_cinterop.kt
new file mode 100644
index 00000000000..97a70aad3af
--- /dev/null
+++ b/native/commonizer/testData/classifierCommonization/typeAliases/commonized/common/package_kotlinx_cinterop.kt
@@ -0,0 +1,5 @@
+// this is to avoid missing Kotlin/Native stdlib
+package kotlinx.cinterop
+
+// fake class with the default constructor and no member scope
+public abstract class CStructVar()
diff --git a/native/commonizer/testData/classifierCommonization/typeAliases/commonized/common/package_root.kt b/native/commonizer/testData/classifierCommonization/typeAliases/commonized/common/package_root.kt
index 3b19acb9b33..e2b24c5e726 100644
--- a/native/commonizer/testData/classifierCommonization/typeAliases/commonized/common/package_root.kt
+++ b/native/commonizer/testData/classifierCommonization/typeAliases/commonized/common/package_root.kt
@@ -28,3 +28,6 @@ typealias U = A // same nullability of the RHS class
 expect class V // different nullability of the RHS class
 typealias W = A // same nullability of the RHS TA
 typealias Y = V // TA at the RHS with the different nullability of own RHS
+
+// Supertypes:
+expect class FILE : kotlinx.cinterop.CStructVar
diff --git a/native/commonizer/testData/classifierCommonization/typeAliases/commonized/linux/package_kotlinx_cinterop.kt b/native/commonizer/testData/classifierCommonization/typeAliases/commonized/linux/package_kotlinx_cinterop.kt
new file mode 100644
index 00000000000..97a70aad3af
--- /dev/null
+++ b/native/commonizer/testData/classifierCommonization/typeAliases/commonized/linux/package_kotlinx_cinterop.kt
@@ -0,0 +1,5 @@
+// this is to avoid missing Kotlin/Native stdlib
+package kotlinx.cinterop
+
+// fake class with the default constructor and no member scope
+public abstract class CStructVar()
diff --git a/native/commonizer/testData/classifierCommonization/typeAliases/commonized/js/package_root.kt b/native/commonizer/testData/classifierCommonization/typeAliases/commonized/linux/package_root.kt
similarity index 86%
rename from native/commonizer/testData/classifierCommonization/typeAliases/commonized/js/package_root.kt
rename to native/commonizer/testData/classifierCommonization/typeAliases/commonized/linux/package_root.kt
index fb2f7ed4e66..f4fafe51685 100644
--- a/native/commonizer/testData/classifierCommonization/typeAliases/commonized/js/package_root.kt
+++ b/native/commonizer/testData/classifierCommonization/typeAliases/commonized/linux/package_root.kt
@@ -16,3 +16,7 @@ actual typealias T = Int
 // Nullability:
 actual typealias V = A? // different nullability of the RHS class
 typealias X = U? // different nullability of the RHS TA
+
+// Supertypes:
+actual typealias FILE = _IO_FILE
+final class _IO_FILE : kotlinx.cinterop.CStructVar {}
diff --git a/native/commonizer/testData/classifierCommonization/typeAliases/commonized/macos/package_kotlinx_cinterop.kt b/native/commonizer/testData/classifierCommonization/typeAliases/commonized/macos/package_kotlinx_cinterop.kt
new file mode 100644
index 00000000000..97a70aad3af
--- /dev/null
+++ b/native/commonizer/testData/classifierCommonization/typeAliases/commonized/macos/package_kotlinx_cinterop.kt
@@ -0,0 +1,5 @@
+// this is to avoid missing Kotlin/Native stdlib
+package kotlinx.cinterop
+
+// fake class with the default constructor and no member scope
+public abstract class CStructVar()
diff --git a/native/commonizer/testData/classifierCommonization/typeAliases/commonized/jvm/package_root.kt b/native/commonizer/testData/classifierCommonization/typeAliases/commonized/macos/package_root.kt
similarity index 87%
rename from native/commonizer/testData/classifierCommonization/typeAliases/commonized/jvm/package_root.kt
rename to native/commonizer/testData/classifierCommonization/typeAliases/commonized/macos/package_root.kt
index 907f7893e33..0acee50ce05 100644
--- a/native/commonizer/testData/classifierCommonization/typeAliases/commonized/jvm/package_root.kt
+++ b/native/commonizer/testData/classifierCommonization/typeAliases/commonized/macos/package_root.kt
@@ -16,3 +16,7 @@ actual typealias T = String
 // Nullability:
 actual typealias V = A // different nullability of the RHS class
 typealias X = U // different nullability of the RHS TA
+
+// Supertypes:
+actual typealias FILE = __sFILE
+final class __sFILE : kotlinx.cinterop.CStructVar {}
diff --git a/native/commonizer/testData/classifierCommonization/typeAliases/original/linux/package_kotlinx_cinterop.kt b/native/commonizer/testData/classifierCommonization/typeAliases/original/linux/package_kotlinx_cinterop.kt
new file mode 100644
index 00000000000..97a70aad3af
--- /dev/null
+++ b/native/commonizer/testData/classifierCommonization/typeAliases/original/linux/package_kotlinx_cinterop.kt
@@ -0,0 +1,5 @@
+// this is to avoid missing Kotlin/Native stdlib
+package kotlinx.cinterop
+
+// fake class with the default constructor and no member scope
+public abstract class CStructVar()
diff --git a/native/commonizer/testData/classifierCommonization/typeAliases/original/js/package_root.kt b/native/commonizer/testData/classifierCommonization/typeAliases/original/linux/package_root.kt
similarity index 94%
rename from native/commonizer/testData/classifierCommonization/typeAliases/original/js/package_root.kt
rename to native/commonizer/testData/classifierCommonization/typeAliases/original/linux/package_root.kt
index ea81e6175a0..0c59bf287db 100644
--- a/native/commonizer/testData/classifierCommonization/typeAliases/original/js/package_root.kt
+++ b/native/commonizer/testData/classifierCommonization/typeAliases/original/linux/package_root.kt
@@ -36,3 +36,7 @@ typealias V = A? // different nullability of the RHS class
 typealias W = U // same nullability of the RHS TA
 typealias X = U? // different nullability of the RHS TA
 typealias Y = V // TA at the RHS with the different nullability of own RHS
+
+// Supertypes:
+typealias FILE = _IO_FILE
+final class _IO_FILE : kotlinx.cinterop.CStructVar {}
diff --git a/native/commonizer/testData/classifierCommonization/typeAliases/original/macos/package_kotlinx_cinterop.kt b/native/commonizer/testData/classifierCommonization/typeAliases/original/macos/package_kotlinx_cinterop.kt
new file mode 100644
index 00000000000..97a70aad3af
--- /dev/null
+++ b/native/commonizer/testData/classifierCommonization/typeAliases/original/macos/package_kotlinx_cinterop.kt
@@ -0,0 +1,5 @@
+// this is to avoid missing Kotlin/Native stdlib
+package kotlinx.cinterop
+
+// fake class with the default constructor and no member scope
+public abstract class CStructVar()
diff --git a/native/commonizer/testData/classifierCommonization/typeAliases/original/jvm/package_root.kt b/native/commonizer/testData/classifierCommonization/typeAliases/original/macos/package_root.kt
similarity index 94%
rename from native/commonizer/testData/classifierCommonization/typeAliases/original/jvm/package_root.kt
rename to native/commonizer/testData/classifierCommonization/typeAliases/original/macos/package_root.kt
index d15760dc16a..d30790598a0 100644
--- a/native/commonizer/testData/classifierCommonization/typeAliases/original/jvm/package_root.kt
+++ b/native/commonizer/testData/classifierCommonization/typeAliases/original/macos/package_root.kt
@@ -36,3 +36,7 @@ typealias V = A // different nullability of the RHS class
 typealias W = U // same nullability of the RHS TA
 typealias X = U // different nullability of the RHS TA
 typealias Y = V // TA at the RHS with the different nullability of own RHS
+
+// Supertypes:
+typealias FILE = __sFILE
+final class __sFILE : kotlinx.cinterop.CStructVar {}