diff --git a/cplusplus/src/p0019.cpp b/cplusplus/src/p0019.cpp
index a6d52924..84dc1874 100644
--- a/cplusplus/src/p0019.cpp
+++ b/cplusplus/src/p0019.cpp
@@ -23,7 +23,8 @@ How many Sundays fell on the first of the month during the twentieth century
 */
 #ifndef EULER_P0019
 #define EULER_P0019
-#include <ctime>
+#include <time.h>
+#include <cstring>
 #include <iostream>
 #include <stdexcept>
 #include <stdint.h>