diff --git a/include/uv.h b/include/uv.h
index af74814c..e6cc61bf 100644
--- a/include/uv.h
+++ b/include/uv.h
@@ -364,17 +364,6 @@ typedef void (*uv_fs_poll_cb)(uv_fs_poll_t* handle,
 
 typedef void (*uv_signal_cb)(uv_signal_t* handle, int signum);
 
-#if defined(MCAST_JOIN_SOURCE_GROUP) && defined(MCAST_LEAVE_SOURCE_GROUP)
-# ifndef IPV6_SSM_SUPPORT
-#  define IPV6_SSM_SUPPORT
-# endif
-# ifndef IPV6_ADD_SOURCE_MEMBERSHIP
-#  define IPV6_ADD_SOURCE_MEMBERSHIP MCAST_JOIN_SOURCE_GROUP
-# endif
-# ifndef IPV6_DROP_SOURCE_MEMBERSHIP
-#  define IPV6_DROP_SOURCE_MEMBERSHIP MCAST_LEAVE_SOURCE_GROUP
-# endif
-#endif
 
 typedef enum {
   UV_LEAVE_GROUP = 0,
diff --git a/src/unix/udp.c b/src/unix/udp.c
index e0576cc4..f884e77a 100644
--- a/src/unix/udp.c
+++ b/src/unix/udp.c
@@ -709,7 +709,6 @@ static int uv__udp_set_source_membership6(uv_udp_t* handle,
                                           const char* interface_addr,
                                           const struct sockaddr_in6* source_addr,
                                           uv_membership membership) {
-#ifdef IPV6_SSM_SUPPORT
   struct group_source_req mreq;
   struct sockaddr_in6 addr6;
   int optname;
@@ -747,9 +746,6 @@ static int uv__udp_set_source_membership6(uv_udp_t* handle,
   }
 
   return 0;
-#else
-  return UV_EPROTONOSUPPORT;
-#endif /* IPV6_SSM_SUPPORT */
 }
 
 
diff --git a/src/win/udp.c b/src/win/udp.c
index c49d68bc..41967ac4 100644
--- a/src/win/udp.c
+++ b/src/win/udp.c
@@ -759,7 +759,6 @@ int uv__udp_set_source_membership6(uv_udp_t* handle,
                                    const char* interface_addr,
                                    const struct sockaddr_in6* source_addr,
                                    uv_membership membership) {
-#ifdef IPV6_SSM_SUPPORT
   struct group_source_req mreq;
   struct sockaddr_in6 addr6;
   int optname;
@@ -804,9 +803,6 @@ int uv__udp_set_source_membership6(uv_udp_t* handle,
   }
 
   return 0;
-#else
-  return UV_EPROTONOSUPPORT;
-#endif /* IPV6_SSM_SUPPORT */
 }