diff --git a/sys/net/if_ovpn.c b/sys/net/if_ovpn.c
index 7bdbc565f4c..6755997fd1f 100644
--- a/sys/net/if_ovpn.c
+++ b/sys/net/if_ovpn.c
@@ -341,6 +341,7 @@ ovpn_nvlist_to_sockaddr(const nvlist_t *nvl, struct sockaddr_storage *sa)
 		size_t len;
 		const void *addr = nvlist_get_binary(nvl, "address", &len);
 		in->sin_family = af;
+		in->sin_len = sizeof(*in);
 		if (len != sizeof(in->sin_addr))
 			return (EINVAL);
 
@@ -355,6 +356,7 @@ ovpn_nvlist_to_sockaddr(const nvlist_t *nvl, struct sockaddr_storage *sa)
 		size_t len;
 		const void *addr = nvlist_get_binary(nvl, "address", &len);
 		in6->sin6_family = af;
+		in6->sin6_len = sizeof(*in6);
 		if (len != sizeof(in6->sin6_addr))
 			return (EINVAL);