diff --git a/QSDispatchQueue/QSDispatchQueue.m b/QSDispatchQueue/QSDispatchQueue.m
index 593b9a6..a3718b0 100644
--- a/QSDispatchQueue/QSDispatchQueue.m
+++ b/QSDispatchQueue/QSDispatchQueue.m
@@ -103,7 +103,7 @@ - (instancetype)initWithQueue:(dispatch_queue_t)queue
             _queue = queue;
         }
         
-        _concurrentCount = MIN(concurrentCount, kMaxConcurrentCount);
+        concurrentCount = MIN(concurrentCount, kMaxConcurrentCount);
         if (concurrentCount < kDefaultConcurrentCount) {
             concurrentCount = kDefaultConcurrentCount;
         }
diff --git a/QSDispatchQueueDemo/QSDispatchQueueDemo.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/QSDispatchQueueDemo/QSDispatchQueueDemo.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 0000000..18d9810
--- /dev/null
+++ b/QSDispatchQueueDemo/QSDispatchQueueDemo.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
diff --git a/QSDispatchQueueDemo/QSDispatchQueueDemo/QSDispatchQueue/QSDispatchQueue.m b/QSDispatchQueueDemo/QSDispatchQueueDemo/QSDispatchQueue/QSDispatchQueue.m
index 593b9a6..a3718b0 100644
--- a/QSDispatchQueueDemo/QSDispatchQueueDemo/QSDispatchQueue/QSDispatchQueue.m
+++ b/QSDispatchQueueDemo/QSDispatchQueueDemo/QSDispatchQueue/QSDispatchQueue.m
@@ -103,7 +103,7 @@ - (instancetype)initWithQueue:(dispatch_queue_t)queue
             _queue = queue;
         }
         
-        _concurrentCount = MIN(concurrentCount, kMaxConcurrentCount);
+        concurrentCount = MIN(concurrentCount, kMaxConcurrentCount);
         if (concurrentCount < kDefaultConcurrentCount) {
             concurrentCount = kDefaultConcurrentCount;
         }