diff --git a/src/net/addr/ip.cpp b/src/net/addr/ip.cpp
index fca752a..16e328f 100644
--- a/src/net/addr/ip.cpp
+++ b/src/net/addr/ip.cpp
@@ -4,4 +4,5 @@
 {
 template In4Addr FromStr<In4Addr>::operator()(std::string_view) const;
 template char* ToStr<In4Addr>::operator()(char*, In4Addr) const noexcept;
+template In6Addr FromStr<In6Addr>::operator()(std::string_view) const;
 } // namespace stdplus