diff --git a/src/main/java/de/ailis/usb4java/support/AbstractIrpQueue.java b/src/main/java/de/ailis/usb4java/support/AbstractIrpQueue.java
index e7bef2d..30f387d 100644
--- a/src/main/java/de/ailis/usb4java/support/AbstractIrpQueue.java
+++ b/src/main/java/de/ailis/usb4java/support/AbstractIrpQueue.java
@@ -170,7 +170,7 @@ public abstract class AbstractIrpQueue<T extends UsbIrp>
     {
         synchronized (this.irps)
         {
-            return this.irps.isEmpty() || this.processor != null;
+            return !this.irps.isEmpty() || this.processor != null;
         }
     }