diff --git a/progress/__init__.py b/progress/__init__.py
index 14aa1c0..a177339 100644
--- a/progress/__init__.py
+++ b/progress/__init__.py
@@ -161,6 +161,8 @@ class Progress(Infinite):
 
     @property
     def progress(self):
+        if self.max == 0:
+            return 0
         return min(1, self.index / self.max)
 
     @property