diff --git a/Source/MIKMIDIClock.m b/Source/MIKMIDIClock.m
index ac5c2cba..7bf45c85 100644
--- a/Source/MIKMIDIClock.m
+++ b/Source/MIKMIDIClock.m
@@ -72,7 +72,7 @@ - (instancetype)initWithQueue:(BOOL)createQueue
 
 #if defined (__MAC_10_10) || defined (__IPHONE_8_0)
 			if (&dispatch_queue_attr_make_with_qos_class != NULL) {
-				attr = dispatch_queue_attr_make_with_qos_class(DISPATCH_QUEUE_SERIAL, QOS_CLASS_USER_INTERACTIVE, DISPATCH_QUEUE_PRIORITY_HIGH);
+				attr = dispatch_queue_attr_make_with_qos_class(DISPATCH_QUEUE_SERIAL, QOS_CLASS_USER_INTERACTIVE, 0);
 			}
 #endif
 
@@ -461,4 +461,4 @@ - (NSMethodSignature *)methodSignatureForSelector:(SEL)sel
 	return [_masterClock methodSignatureForSelector:sel];
 }
 
-@end
\ No newline at end of file
+@end
diff --git a/Source/MIKMIDISequencer.m b/Source/MIKMIDISequencer.m
index fea99926..abc0f52b 100644
--- a/Source/MIKMIDISequencer.m
+++ b/Source/MIKMIDISequencer.m
@@ -175,7 +175,7 @@ - (void)startPlaybackAtTimeStamp:(MusicTimeStamp)timeStamp MIDITimeStamp:(MIDITi
 
 #if defined (__MAC_10_10) || defined (__IPHONE_8_0)
 	if (&dispatch_queue_attr_make_with_qos_class != NULL) {
-		attr = dispatch_queue_attr_make_with_qos_class(DISPATCH_QUEUE_SERIAL, QOS_CLASS_USER_INITIATED, DISPATCH_QUEUE_PRIORITY_HIGH);
+		attr = dispatch_queue_attr_make_with_qos_class(DISPATCH_QUEUE_SERIAL, QOS_CLASS_USER_INITIATED, 0);
 	}
 #endif
 
diff --git a/Source/MIKMIDISynthesizer.m b/Source/MIKMIDISynthesizer.m
index 041ab19a..ad88aff3 100644
--- a/Source/MIKMIDISynthesizer.m
+++ b/Source/MIKMIDISynthesizer.m
@@ -364,7 +364,7 @@ - (void)scheduleMIDICommands:(NSArray *)commands
 
 #if defined (__MAC_10_10) || defined (__IPHONE_8_0)
 		if (&dispatch_queue_attr_make_with_qos_class != NULL) {
-			attr = dispatch_queue_attr_make_with_qos_class(DISPATCH_QUEUE_SERIAL, QOS_CLASS_USER_INTERACTIVE, DISPATCH_QUEUE_PRIORITY_HIGH);
+			attr = dispatch_queue_attr_make_with_qos_class(DISPATCH_QUEUE_SERIAL, QOS_CLASS_USER_INTERACTIVE, 0);
 		}
 #endif