diff --git a/include/core.hpp b/include/core.hpp
index ed454a543..0319e9d87 100644
--- a/include/core.hpp
+++ b/include/core.hpp
@@ -29,6 +29,7 @@ SOFTWARE.
 
 #include <mpi.h>
 #include <occa.hpp>
+#include <cstring>
 #include <string>
 #include <cmath>
 #include <algorithm>