diff --git a/crypto/bn/bn_lib.c b/crypto/bn/bn_lib.c
index af8ec34a496328609c8bfa41e497399014a85585..658a491763db8bd3dc1897530370443c268c221c 100644
--- a/crypto/bn/bn_lib.c
+++ b/crypto/bn/bn_lib.c
@@ -786,9 +786,9 @@ int bn_cmp_part_words(const BN_ULONG *a, const BN_ULONG *b,
 
 	if (dl < 0)
 		{
-		for (i=-dl; i<0; i++)
+		for (i=dl; i<0; i++)
 			{
-			if (b[n+i] != 0)
+			if (b[n-i] != 0)
 				return -1; /* a < b */
 			}
 		}