diff --git a/compiler/testData/codegen/box/callableReference/property/genericProperty.kt b/compiler/testData/codegen/box/callableReference/property/genericProperty.kt
index b0d76b7c397..21d5e9a6646 100644
--- a/compiler/testData/codegen/box/callableReference/property/genericProperty.kt
+++ b/compiler/testData/codegen/box/callableReference/property/genericProperty.kt
@@ -1,3 +1,4 @@
+// !LANGUAGE: -ForbidUsingExtensionPropertyTypeParameterInDelegate
 // DONT_TARGET_EXACT_BACKEND: WASM
 // WASM_MUTE_REASON: PROPERTY_REFERENCES
 // IGNORE_BACKEND: NATIVE
diff --git a/compiler/testData/codegen/box/ir/serializationRegressions/deepGenericDelegatedProperty.kt b/compiler/testData/codegen/box/ir/serializationRegressions/deepGenericDelegatedProperty.kt
index be322310ba3..09397955ed5 100644
--- a/compiler/testData/codegen/box/ir/serializationRegressions/deepGenericDelegatedProperty.kt
+++ b/compiler/testData/codegen/box/ir/serializationRegressions/deepGenericDelegatedProperty.kt
@@ -1,3 +1,4 @@
+// !LANGUAGE: -ForbidUsingExtensionPropertyTypeParameterInDelegate
 // DONT_TARGET_EXACT_BACKEND: WASM
 // WASM_MUTE_REASON: PROPERTY_REFERENCES
 // IGNORE_BACKEND: NATIVE
diff --git a/compiler/testData/codegen/box/ir/serializationRegressions/genericProperty.kt b/compiler/testData/codegen/box/ir/serializationRegressions/genericProperty.kt
index 93d92e76267..af45d7c5381 100644
--- a/compiler/testData/codegen/box/ir/serializationRegressions/genericProperty.kt
+++ b/compiler/testData/codegen/box/ir/serializationRegressions/genericProperty.kt
@@ -1,3 +1,4 @@
+// !LANGUAGE: -ForbidUsingExtensionPropertyTypeParameterInDelegate
 // DONT_TARGET_EXACT_BACKEND: WASM
 // WASM_MUTE_REASON: PROPERTY_REFERENCES
 // IGNORE_BACKEND: NATIVE
diff --git a/compiler/testData/ir/irText/types/genericDelegatedDeepProperty.kt b/compiler/testData/ir/irText/types/genericDelegatedDeepProperty.kt
index cb70c7f8c2d..00f38e26f12 100644
--- a/compiler/testData/ir/irText/types/genericDelegatedDeepProperty.kt
+++ b/compiler/testData/ir/irText/types/genericDelegatedDeepProperty.kt
@@ -1,3 +1,4 @@
+// !LANGUAGE: -ForbidUsingExtensionPropertyTypeParameterInDelegate
 import kotlin.reflect.KProperty1
 import kotlin.reflect.KMutableProperty1
 import kotlin.reflect.KProperty
diff --git a/compiler/testData/writeSignature/backingFieldForGenericDelegated.kt b/compiler/testData/writeSignature/backingFieldForGenericDelegated.kt
index ff2eee93216..78c803fba8a 100644
--- a/compiler/testData/writeSignature/backingFieldForGenericDelegated.kt
+++ b/compiler/testData/writeSignature/backingFieldForGenericDelegated.kt
@@ -1,3 +1,4 @@
+// !LANGUAGE: -ForbidUsingExtensionPropertyTypeParameterInDelegate
 import kotlin.reflect.KProperty
 import kotlin.reflect.KProperty1