diff --git a/gio/gresolver.c b/gio/gresolver.c
index 26d334a10..6aad51791 100644
--- a/gio/gresolver.c
+++ b/gio/gresolver.c
@@ -232,6 +232,10 @@ g_resolver_set_default (GResolver *resolver)
   default_resolver = g_object_ref (resolver);
 }
 
+/* Bionic has res_init() but it's not in any header */
+#ifdef __BIONIC__
+int res_init (void);
+#endif
 
 static void
 g_resolver_maybe_reload (GResolver *resolver)