diff --git a/src/mlpack/core/cv/metrics/roc_auc_score_impl.hpp b/src/mlpack/core/cv/metrics/roc_auc_score_impl.hpp
index 2b4a487559..edaca792d6 100644
--- a/src/mlpack/core/cv/metrics/roc_auc_score_impl.hpp
+++ b/src/mlpack/core/cv/metrics/roc_auc_score_impl.hpp
@@ -29,11 +29,11 @@ double ROCAUCScore<PositiveClass>::Evaluate(const arma::Row<size_t>& labels,
   }
 
   // Compute labels with "1" for positive class and "0" for the other.
-  arma::Col<size_t> binaryLabels = arma::conv_to<arma::Col<size_t>>::from(
+  arma::Col<size_t> binaryLabels = ConvTo<arma::Col<size_t>>::from(
       (labels == PositiveClass));
 
   // Converting probability scores of PositiveClass, from row to column vector.
-  arma::vec colScores = arma::conv_to<arma::vec>::from(scores);
+  arma::vec colScores = ConvTo<arma::vec>::from(scores);
 
   size_t numberOfTrueLabels  = sum(binaryLabels);
   size_t numberOfFalseLabels = binaryLabels.n_rows - numberOfTrueLabels;
@@ -69,7 +69,7 @@ double ROCAUCScore<PositiveClass>::Evaluate(const arma::Row<size_t>& labels,
   cumulativeSum = cumulativeSum(uniqueScoreIndices);
 
   arma::vec tpr, fpr;
-  tpr = arma::conv_to<arma::vec>::from(cumulativeSum);
+  tpr = ConvTo<arma::vec>::from(cumulativeSum);
   fpr = 1 + uniqueScoreIndices - tpr;
   tpr /= numberOfTrueLabels;
   fpr /= numberOfFalseLabels;
diff --git a/src/mlpack/core/data/load_image_impl.hpp b/src/mlpack/core/data/load_image_impl.hpp
index b790782188..49776e50f7 100644
--- a/src/mlpack/core/data/load_image_impl.hpp
+++ b/src/mlpack/core/data/load_image_impl.hpp
@@ -40,7 +40,7 @@ bool Load(const std::string& filename,
     return false;
   }
 
-  matrix = arma::conv_to<arma::Mat<eT>>::from(tempMatrix);
+  matrix = ConvTo<arma::Mat<eT>>::from(tempMatrix);
   Timer::Stop("loading_image");
   return true;
 }
@@ -86,7 +86,7 @@ bool Load(const std::vector<std::string>& files,
       return false;
   }
 
-  matrix = arma::conv_to<arma::Mat<eT>>::from(tmpMatrix);
+  matrix = ConvTo<arma::Mat<eT>>::from(tmpMatrix);
   return true;
 }
 
diff --git a/src/mlpack/core/data/save_image_impl.hpp b/src/mlpack/core/data/save_image_impl.hpp
index e14d56bcb4..24848c3633 100644
--- a/src/mlpack/core/data/save_image_impl.hpp
+++ b/src/mlpack/core/data/save_image_impl.hpp
@@ -34,7 +34,7 @@ bool Save(const std::string& filename,
           const bool fatal)
 {
   arma::Mat<unsigned char> tmpMatrix =
-      arma::conv_to<arma::Mat<unsigned char>>::from(matrix);
+      ConvTo<arma::Mat<unsigned char>>::from(matrix);
 
   return SaveImage(filename, tmpMatrix, info, fatal);
 }
@@ -139,7 +139,7 @@ inline bool SaveImage(const std::string& filename,
   else if ("hdr" == Extension(filename))
   {
     // We'll have to convert to float...
-    arma::fmat tmpImage = arma::conv_to<arma::fmat>::from(image);
+    arma::fmat tmpImage = ConvTo<arma::fmat>::from(image);
     status = stbi_write_hdr(filename.c_str(), info.Width(), info.Height(),
         info.Channels(), tmpImage.memptr());
   }