diff --git a/res/res_sip/config_auth.c b/res/res_sip/config_auth.c
index 5f9e8d0b78..836b90805e 100644
--- a/res/res_sip/config_auth.c
+++ b/res/res_sip/config_auth.c
@@ -86,8 +86,8 @@ static int auth_apply(const struct ast_sorcery *sorcery, void *obj)
 					"specified for auth '%s'\n", ast_sorcery_object_get_id(auth));
 			res = -1;
 		} else if (strlen(auth->md5_creds) != PJSIP_MD5STRLEN) {
-			ast_log(LOG_ERROR, "'md5' authentication requires digest of '%d', but"
-				"digest is of '%d' for auth '%s'\n", PJSIP_MD5STRLEN, (int)strlen(auth->md5_creds),
+			ast_log(LOG_ERROR, "'md5' authentication requires digest of size '%d', but"
+				"digest is '%d' in size for auth '%s'\n", PJSIP_MD5STRLEN, (int)strlen(auth->md5_creds),
 				ast_sorcery_object_get_id(auth));
 			res = -1;
 		}