diff --git a/src/ctobssim/ctobssim.cpp b/src/ctobssim/ctobssim.cpp
index 95dbd99..e493742 100644
--- a/src/ctobssim/ctobssim.cpp
+++ b/src/ctobssim/ctobssim.cpp
@@ -21,7 +21,7 @@
 /**
  * @file ctobssim.cpp
  * @brief CTA observation simulator tool implementation
- * @author J. Knoedlseder
+ * @author Juergen Knoedlseder
  */
 
 /* __ Includes ___________________________________________________________ */
@@ -675,7 +675,7 @@ void ctobssim::simulate_source(GCTAObservation* obs, const GModels& models,
                 for (int i = 0; i < models.size(); ++i) {
                 
                     // Get sky model (NULL if not a sky model)
-                    const GModelSky* model = dynamic_cast<const GModelSky*>(&models[i]);
+                    const GModelSky* model = dynamic_cast<const GModelSky*>(models[i]);
 
                     // If we have a sky model then simulate photons
                     if (model != NULL) {
@@ -846,7 +846,7 @@ void ctobssim::simulate_background(GCTAObservation* obs, const GModels& models,
 
             // Get model (NULL if not a radial acceptance model)
             const GCTAModelRadialAcceptance* model = 
-                  dynamic_cast<const GCTAModelRadialAcceptance*>(&models[i]);
+                  dynamic_cast<const GCTAModelRadialAcceptance*>(models[i]);
 
             // If we have a radial acceptance model then simulate events
             if (model != NULL) {