diff --git a/Start Master (testing only).launch b/Start Master (testing only).launch
index 803bd3b4486e8ea4853f474e0ca60b1012026170..92ef4480469f95b69dddcabcc9929f542185459e 100644
--- a/Start Master (testing only).launch	
+++ b/Start Master (testing only).launch	
@@ -11,5 +11,5 @@
 </listAttribute>
 <stringAttribute key="org.eclipse.jdt.launching.MAIN_TYPE" value="explorviz.live_trace_processing.main.WorkerStarter"/>
 <stringAttribute key="org.eclipse.jdt.launching.PROJECT_ATTR" value="worker"/>
-<stringAttribute key="org.eclipse.jdt.launching.VM_ARGUMENTS" value="-Xmx4G -Dexplorviz.live_trace_processing.worker_enabled=false -Dexplorviz.live_trace_processing.reader_listening_port=10134"/>
+<stringAttribute key="org.eclipse.jdt.launching.VM_ARGUMENTS" value="-Xmx4G -Dexplorviz.live_trace_processing.worker_enabled=false -Dexplorviz.live_trace_processing.reader_listening_port=10133"/>
 </launchConfiguration>