diff --git a/compiler/testData/diagnostics/tests/dataClasses/strange.kt b/compiler/testData/diagnostics/tests/dataClasses/strange.kt
index 7cea5809fd6..7edb3a4593f 100644
--- a/compiler/testData/diagnostics/tests/dataClasses/strange.kt
+++ b/compiler/testData/diagnostics/tests/dataClasses/strange.kt
@@ -1,4 +1,6 @@
 // FIR_IDENTICAL
+// LANGUAGE: +DataObjects
+
 <!WRONG_MODIFIER_TARGET!>data<!> enum class First(val x: Int) {
     A(1),
     B(2)
diff --git a/compiler/util/src/org/jetbrains/kotlin/config/LanguageVersionSettings.kt b/compiler/util/src/org/jetbrains/kotlin/config/LanguageVersionSettings.kt
index 15338044908..d21ca3adae8 100644
--- a/compiler/util/src/org/jetbrains/kotlin/config/LanguageVersionSettings.kt
+++ b/compiler/util/src/org/jetbrains/kotlin/config/LanguageVersionSettings.kt
@@ -260,7 +260,6 @@ enum class LanguageFeature(
     RefineTypeCheckingOnAssignmentsToJavaFields(KOTLIN_1_8, kind = BUG_FIX),
     RangeUntilOperator(KOTLIN_1_8), // KT-15613
     GenericInlineClassParameter(sinceVersion = KOTLIN_1_8, kind = UNSTABLE_FEATURE), // KT-32162
-    DataObjects(KOTLIN_1_8), // KT-4107
     LightweightLambdas(KOTLIN_1_8, defaultState = State.DISABLED),
 
     // 1.9
@@ -284,6 +283,7 @@ enum class LanguageFeature(
     BreakContinueInInlineLambdas(KOTLIN_1_9, defaultState = State.ENABLED), // KT-1436
     EnumEntries(KOTLIN_1_9, sinceApiVersion = ApiVersion.KOTLIN_1_8, defaultState = State.DISABLED, kind = UNSTABLE_FEATURE), // KT-48872
     EnableDfaWarningsInK2(KOTLIN_1_9, kind = OTHER), // KT-50965
+    DataObjects(KOTLIN_1_9), // KT-4107
 
     // Disabled for indefinite time. See KT-53751
     IgnoreNullabilityForErasedValueParameters(sinceVersion = null, kind = BUG_FIX),