diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index e9eb408ae2a8a3ea05d9a23bbc1188cbcd094c5e..aacf1f4b9fb5331a12638f60a49dc04858cfbc01 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -314,7 +314,7 @@ static int nfsd_get_default_max_blksize(void)
 	unsigned long ret;
 
 	si_meminfo(&i);
-	target = i.totalram << PAGE_SHIFT;
+	target = (i.totalram - i.totalhigh) << PAGE_SHIFT;
 	/*
 	 * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig
 	 * machines, but only uses 32K on 128M machines.  Bottom out at