diff --git a/meta/recipes-connectivity/nfs-utils/nfs-utils/nfsserver b/meta/recipes-connectivity/nfs-utils/nfs-utils/nfsserver
index fe76c51..69c8718 100644
--- a/meta/recipes-connectivity/nfs-utils/nfs-utils/nfsserver
+++ b/meta/recipes-connectivity/nfs-utils/nfs-utils/nfsserver
@@ -31,7 +31,7 @@ test -x "$NFS_NFSD" || exit 0
 #
 # Default is 8 threads, value is settable between 1 and the truely
 # ridiculous 99
-test "$NFS_SERVERS" -gt 0 && test "$NFS_SERVERS" -lt 100 || NFS_SERVERS=8
+test "$NFS_SERVERS" != "" && test "$NFS_SERVERS" -gt 0 && test "$NFS_SERVERS" -lt 100 || NFS_SERVERS=8
 #
 # The default state directory is /var/lib/nfs
 test -n "$NFS_STATEDIR" || NFS_STATEDIR=/var/lib/nfs