diff --git a/crypto/bn/bn_lib.c b/crypto/bn/bn_lib.c
index 87972ce7b..af8ec34a4 100644
--- a/crypto/bn/bn_lib.c
+++ b/crypto/bn/bn_lib.c
@@ -786,7 +786,7 @@ 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)
 				return -1; /* a < b */