diff --git a/configure b/configure
index 607a1809737a1bbba3574e85a13508c927b1cdb2..0b7af0195c4912713b516ded60206125ada40fea 100755
--- a/configure
+++ b/configure
@@ -2794,7 +2794,7 @@ texi2html -version > /dev/null 2>&1 && enable texi2html || disable texi2html
 if enabled network; then
     check_type "sys/types.h sys/socket.h" socklen_t
     check_type netdb.h "struct addrinfo"
-    check_type netinet/in.h "struct ipv6_mreq"
+    check_type netinet/in.h "struct ipv6_mreq" -D_DARWIN_C_SOURCE
     check_type netinet/in.h "struct sockaddr_in6"
     check_type "sys/types.h sys/socket.h" "struct sockaddr_storage"
     check_struct "sys/types.h sys/socket.h" "struct sockaddr" sa_len