Index: common/fdlimit/fdlimit_freebsd.go
--- common/fdlimit/fdlimit_freebsd.go.orig	2019-02-20 09:48:12.000000000 +0100
+++ common/fdlimit/fdlimit_freebsd.go	2019-02-23 19:44:58.765076000 +0100
@@ -43,7 +43,7 @@
 	if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
 		return 0, err
 	}
-	return limit.Cur, nil
+	return uint64(limit.Cur), nil
 }
 
 // Current retrieves the number of file descriptors allowed to be opened by this
