diff --git a/src/mlpack/tests/cli_test.cpp b/src/mlpack/tests/cli_test.cpp
index 5f7768f5ce..8a929b9d20 100644
--- a/src/mlpack/tests/cli_test.cpp
+++ b/src/mlpack/tests/cli_test.cpp
@@ -121,8 +121,8 @@ BOOST_AUTO_TEST_CASE(TestBooleanOption)
   // Now, if we specify this flag, it should be true.
   int argc = 2;
   char* argv[2];
-  argv[0] = strcpy(new char[strlen("programname")], "programname");
-  argv[1] = strcpy(new char[strlen("--flag_test")], "--flag_test");
+  argv[0] = strcpy(new char[strlen("programname") + 1], "programname");
+  argv[1] = strcpy(new char[strlen("--flag_test") + 1], "--flag_test");
 
   CLI::ParseCommandLine(argc, argv);