diff --git a/compiler/backend/src/org/jetbrains/kotlin/codegen/coroutines/CoroutineCodegen.kt b/compiler/backend/src/org/jetbrains/kotlin/codegen/coroutines/CoroutineCodegen.kt
index 7a1f79a7b43..e56c5582191 100644
--- a/compiler/backend/src/org/jetbrains/kotlin/codegen/coroutines/CoroutineCodegen.kt
+++ b/compiler/backend/src/org/jetbrains/kotlin/codegen/coroutines/CoroutineCodegen.kt
@@ -236,7 +236,7 @@ class CoroutineCodegenForLambda private constructor(
             val fieldInfo = parameter.getFieldInfoForCoroutineLambdaParameter()
             v.newField(
                 OtherOrigin(parameter),
-                Opcodes.ACC_PRIVATE,
+                Opcodes.ACC_PRIVATE + Opcodes.ACC_SYNTHETIC,
                 fieldInfo.fieldName,
                 fieldInfo.fieldType.descriptor, null, null
             )