diff --git a/ctbGui/ctbPattern.cpp b/ctbGui/ctbPattern.cpp
index e25974988..d03613852 100755
--- a/ctbGui/ctbPattern.cpp
+++ b/ctbGui/ctbPattern.cpp
@@ -872,7 +872,7 @@ void ctbPattern::update() {
 
   eDBitClkPhase->SetNumber(n);
 try {
-  myDet->setSpeed(slsDetectorDefs::DBIT_PIPELINE,0,-1);
+  n=myDet->setSpeed(slsDetectorDefs::DBIT_PIPELINE,-1,0);
       } catch (...) {
     
       cout << "Do nothing for this error" << endl;