--- a/pjlib/include/pj/config.h
+++ b/pjlib/include/pj/config.h
@@ -549,7 +549,7 @@
* Default: 0 (disabled, for now)
*/
#ifndef PJ_HAS_IPV6
-# define PJ_HAS_IPV6 0
+# define PJ_HAS_IPV6 1
#endif
/**