diff --git a/Data/List.hs b/Data/List.hs
index 5b8d7672d01ed6b6b44a864edbb93b28e8c3e0e4..90fccbefce73e79114d598c8a94544bf66a292eb 100644
--- a/Data/List.hs
+++ b/Data/List.hs
@@ -209,7 +209,7 @@ import GHC.List
 import GHC.Base
 #endif
 
-infix 5 \\ 
+infix 5 \\ -- comment to fool cpp
 
 -- -----------------------------------------------------------------------------
 -- List functions