diff --git a/slsDetectorSoftware/slsDetector/slsDetectorBase.h b/slsDetectorSoftware/slsDetector/slsDetectorBase.h
index a31f72167..0fd3233d8 100644
--- a/slsDetectorSoftware/slsDetector/slsDetectorBase.h
+++ b/slsDetectorSoftware/slsDetector/slsDetectorBase.h
@@ -231,7 +231,7 @@ class slsDetectorBase :  public virtual slsDetectorDefs  {
   virtual string createFileName()=0;
 
 
-  virtual void incrementProgress(int i=-1)=0;
+  virtual void incrementProgress(int i=1)=0;
   virtual double getCurrentProgress()=0;
   virtual void incrementFileIndex()=0;
   virtual int setTotalProgress()=0;
diff --git a/slsDetectorSoftware/slsDetector/slsDetectorUtils.h b/slsDetectorSoftware/slsDetector/slsDetectorUtils.h
index 0a948bbd6..56685f91f 100644
--- a/slsDetectorSoftware/slsDetector/slsDetectorUtils.h
+++ b/slsDetectorSoftware/slsDetector/slsDetectorUtils.h
@@ -439,7 +439,7 @@ class slsDetectorUtils :  public slsDetectorActions, public postProcessing {
   double getCurrentProgress();
 
 
-  void incrementProgress(int i=-1);
+  void incrementProgress(int i=1);