diff --git a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java
index cb864463d37..ee4c986f88d 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java
@@ -356,7 +356,7 @@ public interface Errors {
     DiagnosticFactory0<KtElement> INLINE_CLASS_CONSTRUCTOR_WRONG_PARAMETERS_SIZE = DiagnosticFactory0.create(ERROR);
     DiagnosticFactory0<KtParameter> INLINE_CLASS_CONSTRUCTOR_NOT_FINAL_READ_ONLY_PARAMETER = DiagnosticFactory0.create(ERROR);
     DiagnosticFactory0<KtProperty> PROPERTY_WITH_BACKING_FIELD_INSIDE_INLINE_CLASS = DiagnosticFactory0.create(ERROR, DECLARATION_SIGNATURE);
-    DiagnosticFactory0<PsiElement> RESERVED_VAR_PROPERTY_OF_VALUE_CLASS = DiagnosticFactory0.create(WARNING);
+    DiagnosticFactory0<PsiElement> RESERVED_VAR_PROPERTY_OF_VALUE_CLASS = DiagnosticFactory0.create(ERROR);
     DiagnosticFactory0<PsiElement> DELEGATED_PROPERTY_INSIDE_INLINE_CLASS = DiagnosticFactory0.create(ERROR);
     DiagnosticFactory1<KtTypeReference, KotlinType> INLINE_CLASS_HAS_INAPPLICABLE_PARAMETER_TYPE = DiagnosticFactory1.create(ERROR);
     DiagnosticFactory0<PsiElement> INLINE_CLASS_CANNOT_IMPLEMENT_INTERFACE_BY_DELEGATION = DiagnosticFactory0.create(ERROR);
diff --git a/compiler/testData/codegen/box/inlineClasses/interfaceDelegation/memberExtVarDelegationWithInlineClassParameterTypes.kt b/compiler/testData/codegen/box/inlineClasses/interfaceDelegation/memberExtVarDelegationWithInlineClassParameterTypes.kt
index 7808a26a6ab..7691a5028f9 100644
--- a/compiler/testData/codegen/box/inlineClasses/interfaceDelegation/memberExtVarDelegationWithInlineClassParameterTypes.kt
+++ b/compiler/testData/codegen/box/inlineClasses/interfaceDelegation/memberExtVarDelegationWithInlineClassParameterTypes.kt
@@ -6,6 +6,7 @@ import kotlin.test.assertEquals
 inline class S(val xs: Array<String>)
 
 interface IFoo {
+    @Suppress("RESERVED_VAR_PROPERTY_OF_VALUE_CLASS")
     var S.extVar: String
 }
 
@@ -14,12 +15,14 @@ interface GFoo<T> {
 }
 
 object FooImpl : IFoo {
+    @Suppress("RESERVED_VAR_PROPERTY_OF_VALUE_CLASS")
     override var S.extVar: String
         get() = xs[0]
         set(value) { xs[0] = value }
 }
 
 object GFooImpl : GFoo<S> {
+    @Suppress("RESERVED_VAR_PROPERTY_OF_VALUE_CLASS")
     override var S.extVar: String
         get() = xs[0]
         set(value) { xs[0] = value }
diff --git a/compiler/testData/codegen/box/reflection/call/inlineClasses/nonOverridingVarOfInlineClass.kt b/compiler/testData/codegen/box/reflection/call/inlineClasses/nonOverridingVarOfInlineClass.kt
index e365dff5fc0..fce0d470e46 100644
--- a/compiler/testData/codegen/box/reflection/call/inlineClasses/nonOverridingVarOfInlineClass.kt
+++ b/compiler/testData/codegen/box/reflection/call/inlineClasses/nonOverridingVarOfInlineClass.kt
@@ -6,6 +6,7 @@ import kotlin.test.assertEquals
 var global = S("")
 
 inline class Z(val x: Int) {
+    @Suppress("RESERVED_VAR_PROPERTY_OF_VALUE_CLASS")
     var test: S
         get() = S("${global.x}$x")
         set(value) {
@@ -14,6 +15,7 @@ inline class Z(val x: Int) {
 }
 
 inline class L(val x: Long) {
+    @Suppress("RESERVED_VAR_PROPERTY_OF_VALUE_CLASS")
     var test: S
         get() = S("${global.x}$x")
         set(value) {
@@ -22,6 +24,7 @@ inline class L(val x: Long) {
 }
 
 inline class S(val x: String) {
+    @Suppress("RESERVED_VAR_PROPERTY_OF_VALUE_CLASS")
     var test: S
         get() = S("${global.x}$x")
         set(value) {
@@ -30,6 +33,7 @@ inline class S(val x: String) {
 }
 
 inline class A(val x: Any) {
+    @Suppress("RESERVED_VAR_PROPERTY_OF_VALUE_CLASS")
     var test: S
         get() = S("${global.x}$x")
         set(value) {
diff --git a/compiler/testData/codegen/box/reflection/call/inlineClasses/overridingVarOfInlineClass.kt b/compiler/testData/codegen/box/reflection/call/inlineClasses/overridingVarOfInlineClass.kt
index fff7c09b21d..acadf3164a9 100644
--- a/compiler/testData/codegen/box/reflection/call/inlineClasses/overridingVarOfInlineClass.kt
+++ b/compiler/testData/codegen/box/reflection/call/inlineClasses/overridingVarOfInlineClass.kt
@@ -10,6 +10,7 @@ interface ITest {
 }
 
 inline class Z(val x: Int) : ITest {
+    @Suppress("RESERVED_VAR_PROPERTY_OF_VALUE_CLASS")
     override var test: S
         get() = S("${global.x}$x")
         set(value) {
@@ -18,6 +19,7 @@ inline class Z(val x: Int) : ITest {
 }
 
 inline class L(val x: Long) : ITest {
+    @Suppress("RESERVED_VAR_PROPERTY_OF_VALUE_CLASS")
     override var test: S
         get() = S("${global.x}$x")
         set(value) {
@@ -26,6 +28,7 @@ inline class L(val x: Long) : ITest {
 }
 
 inline class S(val x: String) : ITest {
+    @Suppress("RESERVED_VAR_PROPERTY_OF_VALUE_CLASS")
     override var test: S
         get() = S("${global.x}$x")
         set(value) {
@@ -34,6 +37,7 @@ inline class S(val x: String) : ITest {
 }
 
 inline class A(val x: Any) : ITest {
+    @Suppress("RESERVED_VAR_PROPERTY_OF_VALUE_CLASS")
     override var test: S
         get() = S("${global.x}$x")
         set(value) {
diff --git a/compiler/testData/codegen/box/reflection/call/inlineClasses/properties.kt b/compiler/testData/codegen/box/reflection/call/inlineClasses/properties.kt
index 919589dc174..82bcd915d99 100644
--- a/compiler/testData/codegen/box/reflection/call/inlineClasses/properties.kt
+++ b/compiler/testData/codegen/box/reflection/call/inlineClasses/properties.kt
@@ -13,6 +13,7 @@ class C {
     var member: S = S("")
 
     private var suffix = S("")
+    @Suppress("RESERVED_VAR_PROPERTY_OF_VALUE_CLASS")
     var S.memExt: S
         get() = this + suffix
         set(value) { suffix = this + value }
@@ -21,6 +22,7 @@ class C {
 var topLevel: S = S("")
 
 private var suffix = S("")
+@Suppress("RESERVED_VAR_PROPERTY_OF_VALUE_CLASS")
 var S.ext: S
     get() = this + suffix
     set(value) { suffix = this + value }
diff --git a/compiler/testData/codegen/box/reflection/callBy/inlineClassMembers.kt b/compiler/testData/codegen/box/reflection/callBy/inlineClassMembers.kt
index c6c099e1bf6..79b875e724e 100644
--- a/compiler/testData/codegen/box/reflection/callBy/inlineClassMembers.kt
+++ b/compiler/testData/codegen/box/reflection/callBy/inlineClassMembers.kt
@@ -15,6 +15,7 @@ inline class Z(val x: Int) : IFoo {
 
     override fun fooFun(z: Z): Z = Z(z.x + x)
 
+    @Suppress("RESERVED_VAR_PROPERTY_OF_VALUE_CLASS")
     override var fooVar: Z
         get() = Z(global.x + x)
         set(value) {
@@ -23,6 +24,7 @@ inline class Z(val x: Int) : IFoo {
 
     fun barFun(z: Z): Z = Z(z.x * 100 + x)
 
+    @Suppress("RESERVED_VAR_PROPERTY_OF_VALUE_CLASS")
     var barVar: Z
         get() = Z(global.x * 100 + x)
         set(value) {