diff --git a/format.cc b/format.cc
index 9e12e4f7..48bbdad2 100644
--- a/format.cc
+++ b/format.cc
@@ -25,12 +25,6 @@
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-// Disable useless MSVC warnings.
-#undef _CRT_SECURE_NO_WARNINGS
-#define _CRT_SECURE_NO_WARNINGS
-#undef _SCL_SECURE_NO_WARNINGS
-#define _SCL_SECURE_NO_WARNINGS
-
 #include "format.h"
 
 #include <string.h>