diff --git a/ungtc.cpp b/ungtc.cpp
index 6a5ec97..51d1b26 100644
--- a/ungtc.cpp
+++ b/ungtc.cpp
@@ -17,7 +17,8 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
+#include <cstring>
+#include <cstdint>
 #include <iostream>
 #include <fstream>
 #include <vector>