--- ghc-8.8.0.20190721/libraries/containers/containers/include/containers.h~	2019-06-26 20:39:26.000000000 +0000
+++ ghc-8.8.0.20190721/libraries/containers/containers/include/containers.h	2019-07-27 08:55:10.747060247 +0000
@@ -35,7 +35,6 @@
 
 #ifdef __GLASGOW_HASKELL__
 # define USE_ST_MONAD 1
-# define USE_UNBOXED_ARRAYS 1
 #endif
 
 #endif