diff --git a/compiler/testData/diagnostics/wasmTests/jsInterop/inheritance.fir.kt b/compiler/testData/diagnostics/wasmTests/jsInterop/inheritance.fir.kt
index 062d29f9d2d..29263f17485 100644
--- a/compiler/testData/diagnostics/wasmTests/jsInterop/inheritance.fir.kt
+++ b/compiler/testData/diagnostics/wasmTests/jsInterop/inheritance.fir.kt
@@ -20,3 +20,9 @@ class <!NON_EXTERNAL_TYPE_EXTENDS_EXTERNAL_TYPE, NON_EXTERNAL_TYPE_EXTENDS_EXTER
 
 val x1: Any = <!NON_EXTERNAL_TYPE_EXTENDS_EXTERNAL_TYPE!>object<!> : EI1 {}
 val x2: Any = <!NON_EXTERNAL_TYPE_EXTENDS_EXTERNAL_TYPE!>object<!> : EC1() {}
+
+external interface EI2
+
+typealias TA1 = EI2
+
+external class <!EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE!>EC4<!> : TA1
diff --git a/compiler/testData/diagnostics/wasmTests/jsInterop/inheritance.kt b/compiler/testData/diagnostics/wasmTests/jsInterop/inheritance.kt
index e565171e2ea..1460332cd35 100644
--- a/compiler/testData/diagnostics/wasmTests/jsInterop/inheritance.kt
+++ b/compiler/testData/diagnostics/wasmTests/jsInterop/inheritance.kt
@@ -20,3 +20,9 @@ class <!NON_EXTERNAL_TYPE_EXTENDS_EXTERNAL_TYPE, NON_EXTERNAL_TYPE_EXTENDS_EXTER
 
 val x1: Any = <!NON_EXTERNAL_TYPE_EXTENDS_EXTERNAL_TYPE!>object<!> : EI1 {}
 val x2: Any = <!NON_EXTERNAL_TYPE_EXTENDS_EXTERNAL_TYPE!>object<!> : EC1() {}
+
+external interface EI2
+
+typealias TA1 = EI2
+
+external class EC4 : TA1