diff --git a/setup.py b/setup.py
index <HASH>..<HASH> 100755
--- a/setup.py
+++ b/setup.py
@@ -24,7 +24,7 @@ def tag_version():
     """Generate version number from Git Tag, e.g. v2.0.0, v2.0.0-1."""
     recent_tag = subprocess.check_output(shlex.split('git describe --long'))
     tag, count, _ = recent_tag.decode().split('-')
-    version = '-'.join([tag, count]) if int(count) else tag
+    version = 'a'.join([tag, count]) if int(count) else tag
     return version
feat: Default to alpha releases