diff --git a/R.swift/Util/IgnoreFile.swift b/R.swift/Util/IgnoreFile.swift
index 2ff68475..c1c75aac 100644
--- a/R.swift/Util/IgnoreFile.swift
+++ b/R.swift/Util/IgnoreFile.swift
@@ -10,6 +10,10 @@ import Foundation
 
 class IgnoreFile {
   private let patterns: [String]
+  
+  init() {
+    patterns = []
+  }
 
   init(ignoreFileURL: URL) throws {
     let ignoreFileParentPath = ignoreFileURL.baseURL?.absoluteString ?? ""
diff --git a/R.swift/main.swift b/R.swift/main.swift
index 1aa5ee25..bf172180 100644
--- a/R.swift/main.swift
+++ b/R.swift/main.swift
@@ -13,13 +13,6 @@ let IndentationString = "  "
 let ResourceFilename = "R.generated.swift"
 
 var isEdgeEnabled = false
-private func isValidURL(ignoreFile : IgnoreFile?, url: NSURL) -> Bool {
-  if let ignoreFile = ignoreFile {
-    return !ignoreFile.match(url: url)
-  } else {
-    return true
-  }
-}
 
 do {
   let callInformation = try CallInformation(processInfo: ProcessInfo())
@@ -27,15 +20,17 @@ do {
 
   let xcodeproj = try Xcodeproj(url: callInformation.xcodeprojURL)
 
-  var ignoreFile : IgnoreFile? = nil
+  let ignoreFile : IgnoreFile
   if let rswiftignoreURL = callInformation.rswiftignoreURL {
     ignoreFile = try IgnoreFile(ignoreFileURL: rswiftignoreURL)
+  } else {
+    ignoreFile = IgnoreFile()
   }
 
   let resourceURLs = try xcodeproj.resourcePathsForTarget(callInformation.targetName)
     .map(pathResolver(with: callInformation.URLForSourceTreeFolder))
     .flatMap { $0 }
-    .filter { isValidURL(ignoreFile: ignoreFile, url: $0 as NSURL) }
+    .filter { !ignoreFile.match(url: $0 as NSURL) }
 
   let resources = Resources(resourceURLs: resourceURLs, fileManager: FileManager.default)