diff --git a/lib/cpp/test/JSONProtoTest.cpp b/lib/cpp/test/JSONProtoTest.cpp
index 6d1cd8c..082c8a2 100644
--- a/lib/cpp/test/JSONProtoTest.cpp
+++ b/lib/cpp/test/JSONProtoTest.cpp
@@ -22,7 +22,6 @@
 #include <iomanip>
 #include <sstream>
 #include <thrift/protocol/TJSONProtocol.h>
-#include <locale>
 #include <memory>
 #include <thrift/transport/TBufferTransports.h>
 #include "gen-cpp/DebugProtoTest_types.h"
@@ -351,26 +350,3 @@
   BOOST_CHECK_THROW(ooe2.read(proto.get()),
     apache::thrift::protocol::TProtocolException);
 }
-
-BOOST_AUTO_TEST_CASE(test_json_locale_with_thousands_separator_comma) {
-  testCaseSetup_1();
-
-  const std::string expected_result(
-  "{\"1\":{\"tf\":1},\"2\":{\"tf\":0},\"3\":{\"i8\":127},\"4\":{\"i16\":27000},"
-  "\"5\":{\"i32\":16777216},\"6\":{\"i64\":6000000000},\"7\":{\"dbl\":3.1415926"
-  "535897931},\"8\":{\"str\":\"JSON THIS! \\\"\\u0001\"},\"9\":{\"str\":\"\xd7\\"
-  "n\\u0007\\t\"},\"10\":{\"tf\":0},\"11\":{\"str\":\"AQIDrQ\"},\"12\":{\"lst\""
-  ":[\"i8\",3,1,2,3]},\"13\":{\"lst\":[\"i16\",3,1,2,3]},\"14\":{\"lst\":[\"i64"
-  "\",3,1,2,3]}}");
-
-#if _WIN32
-  std::locale::global(std::locale("en-US.UTF-8"));
-#else
-  std::locale::global(std::locale("en_US.UTF-8"));
-#endif
-
-  const std::string result(apache::thrift::ThriftJSONString(*ooe));
-
-  BOOST_CHECK_MESSAGE(!expected_result.compare(result),
-    "Expected:\n" << expected_result << "\nGotten:\n" << result);
-}
diff --git a/lib/cpp/test/ToStringTest.cpp b/lib/cpp/test/ToStringTest.cpp
index 5a05ed7..722e590 100644
--- a/lib/cpp/test/ToStringTest.cpp
+++ b/lib/cpp/test/ToStringTest.cpp
@@ -19,6 +19,7 @@
 
 #include <vector>
 #include <map>
+#include <locale>
 
 #include <boost/test/unit_test.hpp>
 
@@ -40,6 +41,26 @@
   BOOST_CHECK_EQUAL(to_string("abc"), "abc");
 }
 
+BOOST_AUTO_TEST_CASE(locale_en_US_int_to_string) {
+#if _WIN32
+  std::locale::global(std::locale("en-US.UTF-8"));
+#else
+  std::locale::global(std::locale("en_US.UTF-8"));
+#endif
+  BOOST_CHECK_EQUAL(to_string(1000000), "1000000");
+}
+
+BOOST_AUTO_TEST_CASE(locale_de_DE_floating_point_to_string) {
+#if _WIN32
+  std::locale::global(std::locale("de-DE.UTF-8"));
+#else
+  std::locale::global(std::locale("de_DE.UTF-8"));
+#endif
+  BOOST_CHECK_EQUAL(to_string(1.5), "1.5");
+  BOOST_CHECK_EQUAL(to_string(1.5f), "1.5");
+  BOOST_CHECK_EQUAL(to_string(1.5L), "1.5");
+}
+
 BOOST_AUTO_TEST_CASE(empty_vector_to_string) {
   std::vector<int> l;
   BOOST_CHECK_EQUAL(to_string(l), "[]");