diff --git a/lib/roken/getifaddrs.c b/lib/roken/getifaddrs.c
index 99618beb9..3d5584adf 100644
--- a/lib/roken/getifaddrs.c
+++ b/lib/roken/getifaddrs.c
@@ -53,6 +53,11 @@ struct mbuf;
 
 #include <ifaddrs.h>
 
+#ifdef HAVE_IFADDRS_H
+ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
+rk_freeifaddrs(struct ifaddrs *ifp);
+#endif
+
 #ifdef __hpux
 #define lifconf if_laddrconf
 #define lifc_len iflc_len