diff --git a/setup.py b/setup.py
index 28972ad36..0029eb5c1 100644
--- a/setup.py
+++ b/setup.py
@@ -90,7 +90,7 @@ except (ImportError, OSError):
 
 
 NAME = 'Pillow'
-PILLOW_VERSION = '3.1.0.dev'
+PILLOW_VERSION = '3.1.0.dev0'
 TCL_ROOT = None
 JPEG_ROOT = None
 JPEG2K_ROOT = None