diff --git a/cells/opencv/features2d/DescriptorExtractor.cpp b/cells/opencv/features2d/DescriptorExtractor.cpp
index 97b4e08..7afa820 100644
--- a/cells/opencv/features2d/DescriptorExtractor.cpp
+++ b/cells/opencv/features2d/DescriptorExtractor.cpp
@@ -104,7 +104,7 @@ struct EctoDescriptorExtractor
 #else
     descriptor_extractor_ = cv::DescriptorExtractor::create(descriptor_extractor_type_names[T]);
 #endif
-    read_tendrils_as_file_node(params, *descriptor_extractor_);
+    read_tendrils_as_file_node(params, descriptor_extractor_);
   }
 
   int
diff --git a/cells/opencv/features2d/FeatureDetector.cpp b/cells/opencv/features2d/FeatureDetector.cpp
index 80d7ebd..2ec08f5 100644
--- a/cells/opencv/features2d/FeatureDetector.cpp
+++ b/cells/opencv/features2d/FeatureDetector.cpp
@@ -102,8 +102,7 @@ struct EctoFeatureDetector
 #else
     feature_detector_ = cv::FeatureDetector::create(feature_detector_type_names[T]);
 #endif
-
-    read_tendrils_as_file_node(params, *feature_detector_);
+    read_tendrils_as_file_node(params, feature_detector_);
   }
 
   int
diff --git a/cells/opencv/features2d/ORB.cpp b/cells/opencv/features2d/ORB.cpp
index 47e2f5d..658a118 100644
--- a/cells/opencv/features2d/ORB.cpp
+++ b/cells/opencv/features2d/ORB.cpp
@@ -32,7 +32,7 @@ struct ORB
 #if CV_MAJOR_VERSION ==3
     orb_ = cv::ORB::create(*n_features_, *scale_factor_, *n_levels_);
 #elif (CV_MAJOR_VERSION == 2) && (CV_MINOR_VERSION >= 4)
-    orb = cv::Ptr<cv::ORB>(new cv::ORB(*n_features_, *scale_factor_, *n_levels_));
+    orb_ = cv::Ptr<cv::ORB>(new cv::ORB(*n_features_, *scale_factor_, *n_levels_));
 #else
     cv::ORB::CommonParams orb_params;
     orb_params.first_level_ = 0;
diff --git a/cells/opencv/features2d/interfaces.h b/cells/opencv/features2d/interfaces.h
index be66c49..6f79178 100644
--- a/cells/opencv/features2d/interfaces.h
+++ b/cells/opencv/features2d/interfaces.h
@@ -52,7 +52,7 @@ using ecto::tendrils;
 
 template <typename T>
 void
-read_tendrils_as_file_node(const ecto::tendrils & tendrils, T obj) {
+read_tendrils_as_file_node(const ecto::tendrils & tendrils, cv::Ptr<T> obj) {
   // Get the file
   std::string file_name;
   {
@@ -90,7 +90,7 @@ read_tendrils_as_file_node(const ecto::tendrils & tendrils, T obj) {
 
   {
     cv::FileStorage fs(file_name, cv::FileStorage::READ);
-    obj.read(fs.root());
+    obj->read(fs.root());
   }
 
   // Remove the temporary file
diff --git a/cells/opencv/rgbd/Odometry.cpp b/cells/opencv/rgbd/Odometry.cpp
index 76dc1c6..9d31e60 100644
--- a/cells/opencv/rgbd/Odometry.cpp
+++ b/cells/opencv/rgbd/Odometry.cpp
@@ -126,7 +126,7 @@ using namespace std;
 
       if (odometry_.empty())
       {
-          odometry_.reset(new RgbdOdometry());
+          odometry_ = cv::Ptr<RgbdOdometry>(new RgbdOdometry());
 #if CV_VERSION_MAJOR == 3
           odometry_->setCameraMatrix(cameraMatrix);
 #else
diff --git a/test/cells/ImageGen.cpp b/test/cells/ImageGen.cpp
index 3f06b28..1236ef8 100644
--- a/test/cells/ImageGen.cpp
+++ b/test/cells/ImageGen.cpp
@@ -3,7 +3,7 @@
 #include <opencv2/highgui/highgui.hpp>
 #include <iostream>
 #define SHOW() std::cout << __PRETTY_FUNCTION__ << std::endl;
-#if CV_MAJOR_VERSION
+#if CV_MAJOR_VERSION == 3
 #define REFCOUNT(X)  std::cout << "ref count:" << ((X->u) ? (X->u->refcount) : 0) << std::endl;
 #else
 #define REFCOUNT(X)  std::cout << "ref count:" << ((X->refcount) ? *(X->refcount) : 0) << std::endl;