diff --git a/Source/ImageDownloader.swift b/Source/ImageDownloader.swift
index aab3beb6..72032e2a 100644
--- a/Source/ImageDownloader.swift
+++ b/Source/ImageDownloader.swift
@@ -523,7 +523,7 @@ public class ImageDownloader {
 
     func startRequest(request: Request) {
         request.resume()
-        ++activeRequestCount
+        activeRequestCount += 1
     }
 
     func enqueueRequest(request: Request) {
diff --git a/Tests/ImageDownloaderTests.swift b/Tests/ImageDownloaderTests.swift
index 975673a1..cb94c57f 100644
--- a/Tests/ImageDownloaderTests.swift
+++ b/Tests/ImageDownloaderTests.swift
@@ -192,7 +192,7 @@ class ImageDownloaderTestCase: BaseTestCase {
         downloader.downloadImages(URLRequests: [download1, download2], filter: nil) { closureResponse in
             results.append(closureResponse.result)
 
-            ++completedDownloads
+            completedDownloads += 1
             if completedDownloads == 2 { expectation.fulfill() }
         }