diff --git a/NPLib/W1/TW1Physics.h b/NPLib/W1/TW1Physics.h
index 28d62c54a29b4a51983984d2c2b2b488b6c11d0b..988a7b4aa4c2915e33ffa4cd0a768f755827faf3 100644
--- a/NPLib/W1/TW1Physics.h
+++ b/NPLib/W1/TW1Physics.h
@@ -128,7 +128,7 @@ class TW1Physics : public TObject, public NPA::VDetector
    void AddDetector(double theta, double phi, double distance, double beta_u, double beta_v, double beta_w);
 
    // Use for reading Calibration Run, very simple methods; only apply calibration, no condition
-   void ReadCalibrationRun();
+   void ReadCalibrationRun() {};
 
 
  public: // Methods used for event treatement