diff --git a/src/vnet/vnet.h b/src/vnet/vnet.h
index 42f7333..14da23f 100644
--- a/src/vnet/vnet.h
+++ b/src/vnet/vnet.h
@@ -40,6 +40,8 @@
 #ifndef included_vnet_vnet_h
 #define included_vnet_vnet_h
 
+#include <stddef.h>
+
 #include <vppinfra/types.h>
 
 #include <vppinfra/pcap.h>