diff --git a/libs/js/nsprpub/pr/include/md/_freebsd.h b/libs/js/nsprpub/pr/include/md/_freebsd.h
index b684ef79f8..06a6c92f15 100644
--- a/libs/js/nsprpub/pr/include/md/_freebsd.h
+++ b/libs/js/nsprpub/pr/include/md/_freebsd.h
@@ -106,6 +106,11 @@
 #define _PR_IPV6_V6ONLY_PROBE
 #endif
 
+#if __FreeBSD_version >= 601103
+#define _PR_HAVE_GETPROTO_R
+#define _PR_HAVE_5_ARG_GETPROTO_R
+#endif
+
 #define USE_SETJMP
 
 #ifndef _PR_PTHREADS