diff --git a/sys/ufs/ffs/ffs_alloc.c b/sys/ufs/ffs/ffs_alloc.c
index d45cd2e5d149..7bb60a590813 100644
--- a/sys/ufs/ffs/ffs_alloc.c
+++ b/sys/ufs/ffs/ffs_alloc.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)ffs_alloc.c	8.18 (Berkeley) 5/26/95
- * $Id: ffs_alloc.c,v 1.34 1997/08/04 07:30:43 phk Exp $
+ * $Id: ffs_alloc.c,v 1.35 1997/09/02 20:06:44 bde Exp $
  */
 
 #include "opt_quota.h"
@@ -117,7 +117,7 @@ ffs_alloc(ip, lbn, bpref, size, cred, bnp)
 #endif /* DIAGNOSTIC */
 	if (size == fs->fs_bsize && fs->fs_cstotal.cs_nbfree == 0)
 		goto nospace;
-	if (cred->cr_uid != 0 && freespace(fs, fs->fs_minfree) <= 0)
+	if (cred->cr_uid != 0 && freespace(fs, fs->fs_minfree) - size < 0)
 		goto nospace;
 #ifdef QUOTA
 	error = chkdq(ip, (long)btodb(size), cred, 0);