diff --git a/src/netaddress.cpp b/src/netaddress.cpp
index 9884376b3..5d5a75739 100644
--- a/src/netaddress.cpp
+++ b/src/netaddress.cpp
@@ -28,6 +28,7 @@
 #include <tuple>
 
 constexpr uint64_t CNetAddr::V1_SERIALIZATION_SIZE;
+constexpr uint64_t CNetAddr::MAX_ADDRV2_SIZE;
 
 /** check whether a given address is in a network we can probably connect to */
 bool CNetAddr::IsReachableNetwork() {