diff --git a/ghc/lib/std/Makefile b/ghc/lib/std/Makefile
index 0accdab54e4f4fc57ece5385f57d5e273b13969a..fc3955b0d39dc36c2030dd144362b80b872c745b 100644
--- a/ghc/lib/std/Makefile
+++ b/ghc/lib/std/Makefile
@@ -62,7 +62,7 @@ PrelNum_HC_OPTS     += -H30m
 PrelUnsafe_HC_OPTS           += -Onot
 
 PrelBase_HC_OPTS         += -H12m
-PrelRead_HC_OPTS         += -H12m
+PrelRead_HC_OPTS         += -H13m
 PrelTup_HC_OPTS          += -H12m
 PrelArr_HC_OPTS          += -H8m
 PrelHandle_HC_OPTS       += -H12m