diff --git a/include/laser/processor/processor_closeloop_icp.h b/include/laser/processor/processor_closeloop_icp.h
index abb1a91884ef060acbc8fa9eaded2d82451a94ce..8ea5ed16cf957ca4dafd1599fcea659b5e935f93 100644
--- a/include/laser/processor/processor_closeloop_icp.h
+++ b/include/laser/processor/processor_closeloop_icp.h
@@ -143,7 +143,7 @@ struct ParamsProcessorCloseloopIcp : public ParamsProcessorBase
         // hsm_linear_xc_max_npeaks           = _server.getParam<double> (prefix + _unique_name + "/hsm_linear_xc_max_npeaks");
         // hsm_linear_xc_peaks_min_distance   = _server.getParam<double> (prefix + _unique_name + "/hsm_linear_xc_peaks_min_distance");
     }
-    std::string print() const
+    std::string print() const override
     {
         return "\n" + ParamsProcessorBase::print()
             + "recent_key_frames_ignored: " + std::to_string(recent_key_frames_ignored) + "\n"
diff --git a/include/laser/processor/processor_odom_icp.h b/include/laser/processor/processor_odom_icp.h
index 1895c713c9714118c9aa7c4b2ef50b03644a2d83..ac5c30a5c27a1407c58d0a9f1689a657173bfbb4 100644
--- a/include/laser/processor/processor_odom_icp.h
+++ b/include/laser/processor/processor_odom_icp.h
@@ -127,7 +127,7 @@ struct ParamsProcessorOdomIcp : public ParamsProcessorTracker
         // hsm_linear_xc_max_npeaks           = _server.getParam<double> (prefix + _unique_name + "/hsm_linear_xc_max_npeaks");
         // hsm_linear_xc_peaks_min_distance   = _server.getParam<double> (prefix + _unique_name + "/hsm_linear_xc_peaks_min_distance");
     }
-    std::string print() const {
+    std::string print() const override {
         return "\n" + ParamsProcessorTracker::print() + "\n"
                 + "use_point_to_line_distance: "+ std::to_string(use_point_to_line_distance)+ "\n"
                 + "max_correspondence_dist: "   + std::to_string(max_correspondence_dist)   + "\n"
diff --git a/include/laser/processor/processor_tracker_feature_polyline_2d.h b/include/laser/processor/processor_tracker_feature_polyline_2d.h
index 7d68b13b3aa03fc17461c65899372d5535289728..133b2cc14532d8c40f1f1213b2c082a1e71febca 100644
--- a/include/laser/processor/processor_tracker_feature_polyline_2d.h
+++ b/include/laser/processor/processor_tracker_feature_polyline_2d.h
@@ -44,7 +44,7 @@ struct ParamsProcessorTrackerFeaturePolyline2d : public ParamsProcessorTrackerFe
         {
             // TODO write parser!
         }
-        std::string print() const
+        std::string print() const override
         {
             return "\n" + ParamsProcessorTrackerFeature::print();
             // TODO write printer!
diff --git a/include/laser/sensor/sensor_laser_2d.h b/include/laser/sensor/sensor_laser_2d.h
index aa338580fecb80e69fc864bfd345d1cf9db75965..436d17ccd4a31a715ad58003ce7896c5650bd8e0 100644
--- a/include/laser/sensor/sensor_laser_2d.h
+++ b/include/laser/sensor/sensor_laser_2d.h
@@ -34,7 +34,7 @@ struct ParamsSensorLaser2d : public ParamsSensorBase
             scan_params.range_std_dev_  = _server.getParam<double>(prefix + _unique_name + "/LaserScanParams/range_std_dev");
             scan_params.angle_std_dev_  = _server.getParam<double>(prefix + _unique_name + "/LaserScanParams/angle_std_dev");
         }
-        std::string print() const
+        std::string print() const override
         {
             return "\n" + ParamsSensorBase::print()                                                   + "\n"
             + "LaserScanParams/angle_min: "         + std::to_string(scan_params.angle_min_)        + "\n"