diff --git a/e2e/binance/src/test/kotlin/BinanceTest.kt b/e2e/binance/src/test/kotlin/BinanceTest.kt
index 5541dfb..ad1b24c 100644
--- a/e2e/binance/src/test/kotlin/BinanceTest.kt
+++ b/e2e/binance/src/test/kotlin/BinanceTest.kt
@@ -1,7 +1,6 @@
 import binance.client.HttpResult
 import binance.client.api.v3.V3Client
 import binance.models.paths.api.v3.avgPrice.get.response.GetApiV3AvgPriceResponse400
-import binance.models.paths.api.v3.klines.get.parameters.i1.`1`
 import binance.models.paths.api.v3.klines.get.parameters.i1.Interval
 import io.ktor.client.engine.cio.*
 import io.ktor.client.engine.mock.*
diff --git a/e2e/polymorphism/src/test/kotlin/ClientTest.kt b/e2e/polymorphism/src/test/kotlin/ClientTest.kt
index 586e8f9..4e17fbe 100644
--- a/e2e/polymorphism/src/test/kotlin/ClientTest.kt
+++ b/e2e/polymorphism/src/test/kotlin/ClientTest.kt
@@ -5,7 +5,6 @@ import com.denisbrandi.netmock.engine.NetMockEngine
 import kotlinx.coroutines.test.runTest
 import sample.client.Client
 import sample.models.components.parameters.UserType
-import sample.models.components.parameters.UserTypeParam
 import sample.models.components.schemas.AdminUser.AdminUser
 import sample.models.paths.users.get.response.GetUsersResponse200
 import kotlin.test.Test
diff --git a/e2e/polymorphism/src/test/resources/sample.yaml b/e2e/polymorphism/src/test/resources/sample.yaml
index 405e390..b0715aa 100644
--- a/e2e/polymorphism/src/test/resources/sample.yaml
+++ b/e2e/polymorphism/src/test/resources/sample.yaml
@@ -48,6 +48,19 @@ components:
       enum:
         - value1
         - value2
+    Companion:
+      properties:
+        intId:
+          type: integer
+        description:
+          type: string
+
+    CompanionList:
+      properties:
+        companions:
+          type: array
+          items:
+            "$ref": '#/components/schemas/Companion'
     User:
       nullable: true
       description: Normal user
diff --git a/gradle-plugin/processor/src/main/kotlin/com/dshatz/openapi2ktor/generators/TypeStore.kt b/gradle-plugin/processor/src/main/kotlin/com/dshatz/openapi2ktor/generators/TypeStore.kt
index 07c6327..1c0761d 100644
--- a/gradle-plugin/processor/src/main/kotlin/com/dshatz/openapi2ktor/generators/TypeStore.kt
+++ b/gradle-plugin/processor/src/main/kotlin/com/dshatz/openapi2ktor/generators/TypeStore.kt
@@ -1,5 +1,6 @@
 package com.dshatz.openapi2ktor.generators
 
+import com.dshatz.openapi2ktor.generators.Type.Companion.simpleType
 import com.dshatz.openapi2ktor.utils.*
 import com.squareup.kotlinpoet.ClassName
 import com.squareup.kotlinpoet.ParameterizedTypeName.Companion.parameterizedBy
@@ -98,12 +99,14 @@ class TypeStore {
         }
     }
 
-    fun <T: Type> T.makeTypeName(): TypeName {
-        return when (this) {
-            is Type.WithTypeName -> typeName as ClassName
-            is Type.Reference -> resolveReference(jsonReference).makeTypeName()
-            is Type.List -> List::class.asTypeName().parameterizedBy(itemsType.makeTypeName())
-            is Type.SimpleType -> this.kotlinType
+    fun <T: Type> T.makeTypeName(): TypeName = with (ReservedKeywords) {
+        escapeKeywords().run {
+            return when (this) {
+                is Type.WithTypeName -> typeName as ClassName
+                is Type.Reference -> resolveReference(jsonReference).makeTypeName()
+                is Type.List -> List::class.asTypeName().parameterizedBy(itemsType.makeTypeName())
+                is Type.SimpleType -> this.kotlinType
+            }
         }
     }
 
@@ -220,4 +223,13 @@ class TypeStore {
         return sb.toString()
     }
 
-}
\ No newline at end of file
+}
+
+object ReservedKeywords {
+    private val reservedKeywords = setOf("Companion")
+    fun Type.escapeKeywords(): Type {
+        return if (this is Type.WithTypeName && this.simpleName() in reservedKeywords) {
+            this.withTypeName(this.typeName.updateSimpleName { it + "_" })
+        } else this
+    }
+}
diff --git a/gradle-plugin/processor/src/main/kotlin/com/dshatz/openapi2ktor/generators/models/KotlinxCodeGenerator.kt b/gradle-plugin/processor/src/main/kotlin/com/dshatz/openapi2ktor/generators/models/KotlinxCodeGenerator.kt
index c44e67a..5e2f3f6 100644
--- a/gradle-plugin/processor/src/main/kotlin/com/dshatz/openapi2ktor/generators/models/KotlinxCodeGenerator.kt
+++ b/gradle-plugin/processor/src/main/kotlin/com/dshatz/openapi2ktor/generators/models/KotlinxCodeGenerator.kt
@@ -1,6 +1,7 @@
 package com.dshatz.openapi2ktor.generators.models
 
 import com.dshatz.openapi2ktor.GeneratorConfig
+import com.dshatz.openapi2ktor.generators.ReservedKeywords
 import com.dshatz.openapi2ktor.generators.Type
 import com.dshatz.openapi2ktor.generators.TypeStore
 import com.dshatz.openapi2ktor.utils.*
@@ -131,7 +132,7 @@ class KotlinxCodeGenerator(override val typeStore: TypeStore, private val packag
         val typeToSuperInterfaces = interfaceMappingForOneOf(typeStore)
             .mapKeys { it.key.makeTypeName() }
         return typeStore.getTypes().values.filterIsInstance<Type.WithTypeName.Object>().map { type ->
-            val className = type.typeName as ClassName
+            val className = with (ReservedKeywords) { type.escapeKeywords().makeTypeName() as ClassName }
             val fileSpec = FileSpec.builder(className)
 
             val interfacesForOneOf = typeToSuperInterfaces[type.typeName]
@@ -382,9 +383,11 @@ class KotlinxCodeGenerator(override val typeStore: TypeStore, private val packag
 
         val prop = PropertySpec.builder(name, finalType)
             .apply {
+                // Add kdoc
                 if (propInfo.doc != null) {
                     addKdoc(propInfo.doc.toCodeBlock(::findConcreteType))
                 }
+                // Add serializable annotation. From a non-null type.
                 val simpleTypeOrNull = (actualType as? Type.SimpleType)?.kotlinType?.copy(nullable = false)
                 if (simpleTypeOrNull != null && isDate(simpleTypeOrNull)) {
                     addAnnotation(AnnotationSpec.builder(Serializable::class.asClassName()).addMember(CodeBlock.of("%T::class", dateSerializers[simpleTypeOrNull]!!)).build())