diff --git a/scrapy/settings/default_settings.py b/scrapy/settings/default_settings.py
index 52a701edf..05ab4b628 100644
--- a/scrapy/settings/default_settings.py
+++ b/scrapy/settings/default_settings.py
@@ -291,7 +291,7 @@ TELNETCONSOLE_PASSWORD = None
 SPIDER_CONTRACTS = {}
 SPIDER_CONTRACTS_BASE = {
     'scrapy.contracts.default.UrlContract': 1,
-    'scrapy.contracts.default.CallbackKeywordArgumentsContract': 2,
-    'scrapy.contracts.default.ReturnsContract': 3,
-    'scrapy.contracts.default.ScrapesContract': 4,
+    'scrapy.contracts.default.CallbackKeywordArgumentsContract': 1,
+    'scrapy.contracts.default.ReturnsContract': 2,
+    'scrapy.contracts.default.ScrapesContract': 3,
 }