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diff --git a/lib/sqlalchemy/testing/plugin/config.py b/lib/sqlalchemy/testing/plugin/config.py
index 785b69acea6168afdfa5d800effcf2ee13a1be38..946a856ade56b608ef992741f44fe2279f573e63 100644 (file)
--- a/lib/sqlalchemy/testing/plugin/config.py
+++ b/lib/sqlalchemy/testing/plugin/config.py
@@ -70,7 +70,8 @@ def _engine_uri(options, file_config):
     if db_url is None:
         if db_label not in file_config.options('db'):
             raise RuntimeError(
-                "Unknown engine.  Specify --dbs for known engines.")
+                "Unknown URI specifier '%s'.  Specify --dbs for known uris."
+                        % db_label)
         db_url = file_config.get('db', db_label)
 post_configure.append(_engine_uri)