diff --git a/src/mlpack/tests/main_tests/radical_test.cpp b/src/mlpack/tests/main_tests/radical_test.cpp
index a44dbc5a57..e1cb10b1d0 100644
--- a/src/mlpack/tests/main_tests/radical_test.cpp
+++ b/src/mlpack/tests/main_tests/radical_test.cpp
@@ -120,13 +120,13 @@ BOOST_AUTO_TEST_CASE(RadicalBoundsTest)
  */
 BOOST_AUTO_TEST_CASE(RadicalDiffNoiseStdDevTest)
 {
-  arma::mat input = {
-                      {0.497369, 0.891621, 0.565789},
-                      {0.33821, 0.494571, 0.491079},
-                      {0.424898, 0.297599, 0.475061},
-                      {0.285009, 0.152635, 0.878107},
-                      {0.321474, 0.997979, 0.42137}
-                    };
+  std::string inputStr = "0.497369 0.891621 0.565789;";
+  inputStr += "0.33821 0.494571 0.491079;";
+  inputStr += "0.424898 0.297599 0.475061;";
+  inputStr += "0.285009 0.152635 0.878107;";
+  inputStr += "0.321474 0.997979 0.42137";
+
+  arma::mat input(inputStr);
 
   SetInputParam("input", input);
 
@@ -153,13 +153,13 @@ BOOST_AUTO_TEST_CASE(RadicalDiffNoiseStdDevTest)
  */
 BOOST_AUTO_TEST_CASE(RadicalDiffReplicatesTest)
 {
-  arma::mat input = {
-                      {0.497369, 0.891621, 0.565789},
-                      {0.33821, 0.494571, 0.491079},
-                      {0.424898, 0.297599, 0.475061},
-                      {0.285009, 0.152635, 0.878107},
-                      {0.321474, 0.997979, 0.42137}
-                    };
+  std::string inputStr = "0.497369 0.891621 0.565789;";
+  inputStr += "0.33821 0.494571 0.491079;";
+  inputStr += "0.424898 0.297599 0.475061;";
+  inputStr += "0.285009 0.152635 0.878107;";
+  inputStr += "0.321474 0.997979 0.42137";
+
+  arma::mat input(inputStr);
 
   SetInputParam("input", input);
 
@@ -186,13 +186,13 @@ BOOST_AUTO_TEST_CASE(RadicalDiffReplicatesTest)
  */
 BOOST_AUTO_TEST_CASE(RadicalDiffAnglesTest)
 {
-  arma::mat input = {
-                      {0.497369, 0.891621, 0.565789},
-                      {0.33821, 0.494571, 0.491079},
-                      {0.424898, 0.297599, 0.475061},
-                      {0.285009, 0.152635, 0.878107},
-                      {0.321474, 0.997979, 0.42137}
-                    };
+  std::string inputStr = "0.497369 0.891621 0.565789;";
+  inputStr += "0.33821 0.494571 0.491079;";
+  inputStr += "0.424898 0.297599 0.475061;";
+  inputStr += "0.285009 0.152635 0.878107;";
+  inputStr += "0.321474 0.997979 0.42137";
+
+  arma::mat input(inputStr);
 
   SetInputParam("input", input);
 
@@ -219,13 +219,13 @@ BOOST_AUTO_TEST_CASE(RadicalDiffAnglesTest)
  */
 BOOST_AUTO_TEST_CASE(RadicalDiffSweepsTest)
 {
-  arma::mat input = {
-                      {0.497369, 0.891621, 0.565789},
-                      {0.33821, 0.494571, 0.491079},
-                      {0.424898, 0.297599, 0.475061},
-                      {0.285009, 0.152635, 0.878107},
-                      {0.321474, 0.997979, 0.42137}
-                    };
+  std::string inputStr = "0.497369 0.891621 0.565789;";
+  inputStr += "0.33821 0.494571 0.491079;";
+  inputStr += "0.424898 0.297599 0.475061;";
+  inputStr += "0.285009 0.152635 0.878107;";
+  inputStr += "0.321474 0.997979 0.42137";
+
+  arma::mat input(inputStr);
 
   SetInputParam("input", input);