diff --git a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/GeneratorHelpers.kt b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/GeneratorHelpers.kt
index 2a823f553fd..d345189b018 100644
--- a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/GeneratorHelpers.kt
+++ b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/GeneratorHelpers.kt
@@ -7,6 +7,7 @@ package org.jetbrains.kotlinx.serialization.compiler.backend.ir
 
 import org.jetbrains.kotlin.backend.common.deepCopyWithVariables
 import org.jetbrains.kotlin.backend.common.lower.DeclarationIrBuilder
+import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
 import org.jetbrains.kotlin.ir.builders.*
@@ -21,11 +22,14 @@ import org.jetbrains.kotlin.ir.types.impl.IrSimpleTypeImpl
 import org.jetbrains.kotlin.ir.types.impl.makeTypeProjection
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.js.resolve.diagnostics.findPsi
+import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.platform.jvm.isJvm
 import org.jetbrains.kotlin.resolve.descriptorUtil.classId
 import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
 import org.jetbrains.kotlin.resolve.descriptorUtil.isEffectivelyExternal
 import org.jetbrains.kotlin.resolve.descriptorUtil.module
+import org.jetbrains.kotlin.resolve.jvm.JvmPrimitiveType
 import org.jetbrains.kotlin.types.*
 import org.jetbrains.kotlin.types.typeUtil.isTypeParameter
 import org.jetbrains.kotlin.types.typeUtil.makeNotNullable
@@ -693,7 +697,7 @@ interface IrBuilderExtension {
 
         }
         if (serializerClassOriginal.classId == referenceArraySerializerId) {
-            args = listOf(classReference(kType.arguments[0].type)) + args
+            args = listOf(wrapperClassReference(kType.arguments.single().type)) + args
             typeArgs = listOf(typeArgs[0].makeNotNull()) + typeArgs
         }
 
@@ -714,6 +718,19 @@ interface IrBuilderExtension {
         return irInvoke(null, ctor, typeArguments = typeArgs, valueArguments = args, returnTypeHint = substitutedReturnType)
     }
 
+    private fun IrBuilderWithScope.wrapperClassReference(classType: KotlinType): IrClassReference {
+        if (compilerContext.platform.isJvm()) {
+            // "Byte::class" -> "java.lang.Byte::class"
+            val wrapperFqName = KotlinBuiltIns.getPrimitiveType(classType)?.let(JvmPrimitiveType::get)?.wrapperFqName
+            if (wrapperFqName != null) {
+                val wrapperClass = compilerContext.moduleDescriptor.findClassAcrossModuleDependencies(ClassId.topLevel(wrapperFqName))
+                    ?: error("Primitive wrapper class for $classType not found: $wrapperFqName")
+                return classReference(wrapperClass.defaultType)
+            }
+        }
+        return classReference(classType)
+    }
+
     private fun findSerializerConstructorForTypeArgumentsSerializers(serializer: ClassDescriptor): IrConstructorSymbol? {
         val serializableImplementationTypeArguments = extractKSerializerArgumentFromImplementation(serializer)?.arguments
             ?: throw AssertionError("Serializer does not implement KSerializer??")