diff --git a/plugins/kotlin/idea/src/org/jetbrains/kotlin/idea/inspections/ConvertObjectToDataObjectInspection.kt b/plugins/kotlin/idea/src/org/jetbrains/kotlin/idea/inspections/ConvertObjectToDataObjectInspection.kt
index 532635eecdad..080e8c8be1ba 100644
--- a/plugins/kotlin/idea/src/org/jetbrains/kotlin/idea/inspections/ConvertObjectToDataObjectInspection.kt
+++ b/plugins/kotlin/idea/src/org/jetbrains/kotlin/idea/inspections/ConvertObjectToDataObjectInspection.kt
@@ -97,7 +97,7 @@ private fun KtExpression.tryUnwrapElvisOrDoubleBang(context: Lazy<BindingContext
 private fun isCompatibleEquals(ktObject: KtObjectDeclaration, ktObjectFqn: Lazy<FqName>): Boolean =
     when (val equals = ktObject.findEquals()) {
         is Function -> ktObjectFqn.value == equals.function.singleExpressionBody()
-            ?.asSafely<KtIsExpression>()?.typeReference?.let { typeReference ->
+            ?.asSafely<KtIsExpression>()?.takeUnless(KtIsExpression::isNegated)?.typeReference?.let { typeReference ->
                 typeReference.analyze(BodyResolveMode.PARTIAL_NO_ADDITIONAL)[BindingContext.TYPE, typeReference]?.fqName
             }
         NonTrivialSuper -> false
diff --git a/plugins/kotlin/idea/tests/test/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java b/plugins/kotlin/idea/tests/test/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java
index 11b061f5db43..20acb2e88511 100644
--- a/plugins/kotlin/idea/tests/test/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java
+++ b/plugins/kotlin/idea/tests/test/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java
@@ -4015,6 +4015,11 @@ public abstract class LocalInspectionTestGenerated extends AbstractLocalInspecti
             runTest("testData/inspectionsLocal/convertObjectToDataObject/notCompatibleEquals.kt");
         }
 
+        @TestMetadata("notCompatibleEquals2.kt")
+        public void testNotCompatibleEquals2() throws Exception {
+            runTest("testData/inspectionsLocal/convertObjectToDataObject/notCompatibleEquals2.kt");
+        }
+
         @TestMetadata("notCompatibleInheritedEquals.kt")
         public void testNotCompatibleInheritedEquals() throws Exception {
             runTest("testData/inspectionsLocal/convertObjectToDataObject/notCompatibleInheritedEquals.kt");
diff --git a/plugins/kotlin/idea/tests/testData/inspectionsLocal/convertObjectToDataObject/notCompatibleEquals2.kt b/plugins/kotlin/idea/tests/testData/inspectionsLocal/convertObjectToDataObject/notCompatibleEquals2.kt
new file mode 100644
index 000000000000..61a59e0a8feb
--- /dev/null
+++ b/plugins/kotlin/idea/tests/testData/inspectionsLocal/convertObjectToDataObject/notCompatibleEquals2.kt
@@ -0,0 +1,6 @@
+// COMPILER_ARGUMENTS: -XXLanguage:+DataObjects
+// PROBLEM: none
+object<caret> Foo {
+    override fun toString(): String = "Foo"
+    override fun equals(other: Any?): Boolean = other !is Foo
+}