diff --git a/modules/features2d/src/orb.cpp b/modules/features2d/src/orb.cpp
index 3b15be2e70..132b6bda4a 100644
--- a/modules/features2d/src/orb.cpp
+++ b/modules/features2d/src/orb.cpp
@@ -470,7 +470,7 @@ ORB::ORB(size_t n_features, const CommonParams & detector_params) :
 {
   // fill the extractors and descriptors for the corresponding scales
   float factor = 1.0 / params_.scale_factor_ / params_.scale_factor_;
-  int n_desired_features_per_scale = cvRound(n_features / ((std::pow(factor, params_.n_levels_) - 1) / (factor - 1)));
+  int n_desired_features_per_scale = cvRound(n_features / ((std::pow(factor, (int)params_.n_levels_) - 1) / (factor - 1)));
   n_features_per_level_.resize(detector_params.n_levels_);
   for (unsigned int level = 0; level < detector_params.n_levels_; level++)
   {