diff --git a/sll/trunk/cypher.cc b/sll/trunk/cypher.cc
index 01485946e13cf3d7666353a9ccfe1d7b71a10f29..b9aa4e2c2d77056e7322883152556aaf5e23d3ae 100644
--- a/sll/trunk/cypher.cc
+++ b/sll/trunk/cypher.cc
@@ -52,7 +52,7 @@ string Cypher::sha1_64(const char *data, size_t size) {
   BIO_get_mem_ptr(b64, &bptr);
 
   if (bptr->length > 0)
-    ret.insert(0, bptr->data, bptr->length);
+    ret.insert(0, bptr->data, bptr->length - 1);
   else
     throw Error(ERR_CYPHER, "Unable to compute sha1_64");