diff --git a/_setup/py2/setup.py b/_setup/py2/setup.py
index b2fcde8..8b15d49 100644
--- a/_setup/py2/setup.py
+++ b/_setup/py2/setup.py
@@ -369,6 +369,8 @@ def run(config=('package.cfg',), ext=None, script_args=None, manifest_only=0):
     revision = pkg.get('version.revision', '').strip()
     if revision:
         revision = int(revision)
+    else:
+        revision = 0
 
     kwargs = {
         'name': pkg['name'],
diff --git a/_setup/py3/setup.py b/_setup/py3/setup.py
index 8a30540..bb1e2ee 100644
--- a/_setup/py3/setup.py
+++ b/_setup/py3/setup.py
@@ -374,6 +374,8 @@ def run(config=('package.cfg',), ext=None, script_args=None, manifest_only=0):
     revision = pkg.get('version.revision', '').strip()
     if revision:
         revision = int(revision)
+    else:
+        revision = 0
 
     kwargs = {
         'name': pkg['name'],