diff --git a/distribute.py b/distribute.py
index d5729e4df..11bd65919 100755
--- a/distribute.py
+++ b/distribute.py
@@ -252,7 +252,7 @@ def main():
             "-q",
             "egg_info",
             "--tag-build",
-            "+renpy" + args.version,
+            "+renpy" + args.version.replace("+", "-"),
             "sdist",
             "-d",
             os.path.abspath(destination)