diff --git a/ghc/lib/ghc/PrelBase.lhs b/ghc/lib/ghc/PrelBase.lhs
index 3b67ad9b0b1de081b96b4ac9c747df9188619b91..97ac8c35ee92fc8225a75cc9e18dfb42377f6c3e 100644
--- a/ghc/lib/ghc/PrelBase.lhs
+++ b/ghc/lib/ghc/PrelBase.lhs
@@ -16,7 +16,8 @@ module PrelBase(
 import {-# SOURCE #-}	IOBase	( error )	
 import GHC
 
-infixr 9  ., !!
+infixr 9  .
+infixl 9  !!
 infixl 7  *
 infixl 6  +, -
 infixr 5  ++, :