diff --git a/pymongo/__init__.py b/pymongo/__init__.py
index b037d4363..1206e4784 100644
--- a/pymongo/__init__.py
+++ b/pymongo/__init__.py
@@ -67,7 +67,7 @@ SLOW_ONLY = 1
 ALL = 2
 """Profile all operations."""
 
-version_tuple = (2, 5, 1)
+version_tuple = (2, 5, 1, '+')
 
 def get_version_string():
     if isinstance(version_tuple[-1], basestring):
diff --git a/setup.py b/setup.py
index ee53dc597..1ba33b6d8 100755
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,7 @@ from distutils.errors import CCompilerError
 from distutils.errors import DistutilsPlatformError, DistutilsExecError
 from distutils.core import Extension
 
-version = "2.5.1"
+version = "2.5.1+"
 
 f = open("README.rst")
 try: