diff --git a/CHANGES b/CHANGES
index 85ab6c7..18e4d93 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,5 +1,8 @@
 Version 0.4
 -----------
+9/8/2018   Fixed Issue #14.  YaccProduction index property causes
+           AttributeError if index is 0
+
 9/5/2018   Added support for getattr() and related functions on
            productions.
 
diff --git a/sly/yacc.py b/sly/yacc.py
index b6a6710..5e2fa9d 100644
--- a/sly/yacc.py
+++ b/sly/yacc.py
@@ -139,7 +139,7 @@ class YaccProduction:
             if isinstance(tok, YaccSymbol):
                 continue
             index = getattr(tok, 'index', None)
-            if index:
+            if index is not None:
                 return index
         raise AttributeError('No index attribute found')