diff --git a/pandas/core/index.py b/pandas/core/index.py
index 0f3a4adb0b33a..4c94ab66d3de2 100644
--- a/pandas/core/index.py
+++ b/pandas/core/index.py
@@ -1055,7 +1055,7 @@ def __hash__(self):
         raise TypeError("unhashable type: %r" % type(self).__name__)
 
     def __setitem__(self, key, value):
-        raise TypeError("Indexes does not support mutable operations")
+        raise TypeError("Indexes do not support mutable operations")
 
     def __getitem__(self, key):
         """