diff --git a/src/objective-c/GRPCClient/GRPCCall.m b/src/objective-c/GRPCClient/GRPCCall.m
index ede16b42e8c..19de004cbcd 100644
--- a/src/objective-c/GRPCClient/GRPCCall.m
+++ b/src/objective-c/GRPCClient/GRPCCall.m
@@ -147,12 +147,16 @@ const char *kCFStreamVarName = "grpc_cfstream";
     _handler = responseHandler;
     _initialMetadataPublished = NO;
     _pipe = [GRXBufferedPipe pipe];
-    if (@available(iOS 8.0, *)) {
+    // Set queue QoS only when iOS version is 8.0 or above and Xcode version is 9.0 or above
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 110000 || __MAC_OS_X_VERSION_MAX_ALLOWED >= 101300
+    if (@available(iOS 8.0, macOS 10.10, *)) {
       _dispatchQueue = dispatch_queue_create(
           NULL,
           dispatch_queue_attr_make_with_qos_class(DISPATCH_QUEUE_SERIAL, QOS_CLASS_DEFAULT, 0));
     } else {
-      // Fallback on earlier versions
+#else
+    {
+#endif
       _dispatchQueue = dispatch_queue_create(NULL, DISPATCH_QUEUE_SERIAL);
     }
     dispatch_set_target_queue(_dispatchQueue ,responseHandler.dispatchQueue);
diff --git a/src/objective-c/GRPCClient/private/GRPCChannel.m b/src/objective-c/GRPCClient/private/GRPCChannel.m
index 997d1ff663c..0220141db04 100644
--- a/src/objective-c/GRPCClient/private/GRPCChannel.m
+++ b/src/objective-c/GRPCClient/private/GRPCChannel.m
@@ -204,14 +204,17 @@ static const NSTimeInterval kDefaultChannelDestroyDelay = 30;
 
   if ((self = [super init])) {
     _configuration = [channelConfiguration copy];
-    if (@available(iOS 8.0, *)) {
+#if __IPHONE_OS_VERSION_MAX_ALLOWED < 110000 || __MAC_OS_X_VERSION_MAX_ALLOWED < 101300
+    if (@available(iOS 8.0, macOS 10.10, *)) {
       _dispatchQueue = dispatch_queue_create(
           NULL,
           dispatch_queue_attr_make_with_qos_class(DISPATCH_QUEUE_SERIAL, QOS_CLASS_DEFAULT, 0));
     } else {
+#else
+    {
+#endif
       _dispatchQueue = dispatch_queue_create(NULL, DISPATCH_QUEUE_SERIAL);
     }
-
     // Create gRPC core channel object.
     NSString *host = channelConfiguration.host;
     NSAssert(host.length != 0, @"host cannot be nil");
diff --git a/src/objective-c/ProtoRPC/ProtoRPC.m b/src/objective-c/ProtoRPC/ProtoRPC.m
index 9f45bdfcd46..9164f2320bf 100644
--- a/src/objective-c/ProtoRPC/ProtoRPC.m
+++ b/src/objective-c/ProtoRPC/ProtoRPC.m
@@ -105,11 +105,17 @@ static NSError *ErrorForBadProto(id proto, Class expectedClass, NSError *parsing
     _handler = handler;
     _callOptions = [callOptions copy];
     _responseClass = responseClass;
-    if (@available(iOS 8.0, *)) {
+
+    // Set queue QoS only when iOS version is 8.0 or above and Xcode version is 9.0 or above
+#if __IPHONE_OS_VERSION_MAX_ALLOWED < 110000 || __MAC_OS_X_VERSION_MAX_ALLOWED < 101300
+    if (@available(iOS 8.0, macOS 10.10, *)) {
       _dispatchQueue = dispatch_queue_create(
           NULL,
           dispatch_queue_attr_make_with_qos_class(DISPATCH_QUEUE_SERIAL, QOS_CLASS_DEFAULT, 0));
     } else {
+#else
+    {
+#endif
       _dispatchQueue = dispatch_queue_create(nil, DISPATCH_QUEUE_SERIAL);
     }
     dispatch_set_target_queue(_dispatchQueue, handler.dispatchQueue);