diff --git a/include/fmt/os.h b/include/fmt/os.h
index 65d018e85073..297612fc8322 100644
--- a/include/fmt/os.h
+++ b/include/fmt/os.h
@@ -502,7 +502,7 @@ class locale {
 
   // Converts string to floating-point number and advances str past the end
   // of the parsed input.
-  double strtod(const char*& str) const {
+  FMT_DEPRECATED double strtod(const char*& str) const {
     char* end = nullptr;
     double result = strtod_l(str, &end, locale_);
     str = end;
diff --git a/test/os-test.cc b/test/os-test.cc
index 01ab7036c678..5b5ef76ed698 100644
--- a/test/os-test.cc
+++ b/test/os-test.cc
@@ -548,13 +548,4 @@ TEST(file_test, fdopen) {
   int read_fd = read_end.descriptor();
   EXPECT_EQ(read_fd, FMT_POSIX(fileno(read_end.fdopen("r").get())));
 }
-
-#  ifdef FMT_LOCALE
-TEST(locale_test, strtod) {
-  fmt::locale loc;
-  const char *start = "4.2", *ptr = start;
-  EXPECT_EQ(4.2, loc.strtod(ptr));
-  EXPECT_EQ(start + 3, ptr);
-}
-#  endif
 #endif  // FMT_USE_FCNTL
diff --git a/test/posix-mock-test.cc b/test/posix-mock-test.cc
index 191d7aef83e2..255e216c998a 100644
--- a/test/posix-mock-test.cc
+++ b/test/posix-mock-test.cc
@@ -467,9 +467,6 @@ struct locale_mock {
   MOCK_METHOD3(newlocale, locale_type(int category_mask, const char* locale,
                                       locale_type base));
   MOCK_METHOD1(freelocale, void(locale_type locale));
-
-  MOCK_METHOD3(strtod_l,
-               double(const char* nptr, char** endptr, locale_type locale));
 } * locale_mock::instance;
 
 #  ifdef _MSC_VER
@@ -487,10 +484,6 @@ _locale_t _create_locale(int category, const char* locale) {
 void _free_locale(_locale_t locale) {
   locale_mock::instance->freelocale(locale);
 }
-
-double _strtod_l(const char* nptr, char** endptr, _locale_t locale) {
-  return locale_mock::instance->strtod_l(nptr, endptr, locale);
-}
 #    ifdef __clang__
 #      pragma clang diagnostic pop
 #    endif
@@ -516,11 +509,6 @@ FreeLocaleResult freelocale(locale_type locale) FMT_LOCALE_THROW {
   return FreeLocaleResult();
 }
 
-double strtod_l(const char* nptr, char** endptr,
-                locale_type locale) FMT_LOCALE_THROW {
-  return locale_mock::instance->strtod_l(nptr, endptr, locale);
-}
-
 #  undef FMT_LOCALE_THROW
 
 #  ifndef _WIN32
@@ -549,18 +537,4 @@ TEST(locale_test, locale) {
   EXPECT_EQ(impl, loc.get());
 }
 
-TEST(locale_test, strtod) {
-  scoped_mock<locale_mock> mock;
-  EXPECT_CALL(mock, newlocale(_, _, _))
-      .WillOnce(Return(reinterpret_cast<locale_type>(42)));
-  EXPECT_CALL(mock, freelocale(_));
-  fmt::locale loc;
-  const char* str = "4.2";
-  char end = 'x';
-  EXPECT_CALL(mock, strtod_l(str, _, loc.get()))
-      .WillOnce(testing::DoAll(testing::SetArgPointee<1>(&end), Return(777)));
-  EXPECT_EQ(777, loc.strtod(str));
-  EXPECT_EQ(&end, str);
-}
-
 #endif  // FMT_LOCALE