diff --git a/src/interface.c b/src/interface.c
index 9fce09f16..f49488741 100644
--- a/src/interface.c
+++ b/src/interface.c
@@ -11013,12 +11013,12 @@ int sip_auth_parse_hash (u8 *input_buf, u32 input_len, hash_t *hash_buf, MAYBE_U
 
   u32 md5_max_len = 4 * 64;
 
-  u32 total_length = method_len + 1 + URI_prefix_len + URI_prefix_len + URI_resource_len + URI_suffix_len + URI_suffix_len;
+  u32 total_length = method_len + 1 + URI_prefix_len + URI_resource_len + URI_suffix_len;
 
   if (URI_prefix_len) total_length++;
   if (URI_suffix_len) total_length++;
 
-  if (total_length > md5_max_len) return (PARSER_SALT_LENGTH);
+  if (total_length >= md5_max_len) return (PARSER_SALT_LENGTH);
 
   u32 md5_remaining_len = md5_max_len;