diff --git a/spf.py b/spf.py
index a3f468e..8c8b907 100755
--- a/spf.py
+++ b/spf.py
@@ -111,7 +111,7 @@ class SPFInterpreter(lark.visitors.Interpreter):
 
     def list_get(self, el):
         (left, right) = self.visit_children(el)
-        return left[right]
+        return left[right-1]
 
 
     def expression(self, el):