diff --git a/src/upf/arp-nd.cpp b/src/upf/arp-nd.cpp
index 1fc26fec4..abf0e7691 100644
--- a/src/upf/arp-nd.cpp
+++ b/src/upf/arp-nd.cpp
@@ -17,6 +17,8 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+#include <cstdint>
+
 #include <tins/arp.h>
 #include <tins/ethernetII.h>
 #include <tins/hw_address.h>