diff --git a/packages/relay-compiler/codegen/RelayFileWriter.js b/packages/relay-compiler/codegen/RelayFileWriter.js
index f0e19d507b6b5..560194f1d9795 100644
--- a/packages/relay-compiler/codegen/RelayFileWriter.js
+++ b/packages/relay-compiler/codegen/RelayFileWriter.js
@@ -11,13 +11,13 @@
 'use strict';
 
 const ASTConvert = require('../core/ASTConvert');
-const CodegenDirectory = require('../codegen/CodegenDirectory');
 const CompilerContext = require('../core/GraphQLCompilerContext');
 const Profiler = require('../core/GraphQLCompilerProfiler');
 const RelayParser = require('../core/RelayParser');
 const RelayValidator = require('../core/RelayValidator');
 const SchemaUtils = require('../core/GraphQLSchemaUtils');
 
+const CodegenDirectory = require('./CodegenDirectory');
 const compileRelayArtifacts = require('./compileRelayArtifacts');
 const crypto = require('crypto');
 const graphql = require('graphql');
@@ -31,15 +31,16 @@ const {
 } = require('../core/GraphQLDerivedFromMetadata');
 const {Map: ImmutableMap} = require('immutable');
 
+import type {DocumentNode, GraphQLSchema, ValidationContext} from 'graphql';
 import type {
   FormatModule,
   TypeGenerator,
 } from '../language/RelayLanguagePluginInterface';
 import type {ScalarTypeMapping} from '../language/javascript/RelayFlowTypeTransformers';
 import type {GraphQLReporter as Reporter} from '../reporters/GraphQLReporter';
+import type {Filesystem} from './CodegenDirectory';
 import type {SourceControl} from './SourceControl';
 import type {RelayCompilerTransforms} from './compileRelayArtifacts';
-import type {DocumentNode, GraphQLSchema, ValidationContext} from 'graphql';
 
 const {isExecutableDefinitionAST} = SchemaUtils;
 
@@ -75,6 +76,7 @@ export type WriterConfig = {
     LOCAL_RULES?: $ReadOnlyArray<ValidationRule>,
   },
   printModuleDependency?: string => string,
+  filesystem?: Filesystem,
   repersist?: boolean,
 };
 
@@ -259,6 +261,7 @@ function writeAll({
     const addCodegenDir = dirPath => {
       const codegenDir = new CodegenDirectory(dirPath, {
         onlyValidate: onlyValidate,
+        filesystem: writerConfig.filesystem,
       });
       allOutputDirectories.set(dirPath, codegenDir);
       return codegenDir;