diff --git a/benchmarks/cassava-iut.cabal b/benchmarks/cassava-iut.cabal
index 4e12cf4..b1a4d48 100644
--- a/benchmarks/cassava-iut.cabal
+++ b/benchmarks/cassava-iut.cabal
@@ -13,6 +13,8 @@ Extra-source-files:  *.csv
 
 flag pre-bytestring-0-10-4
   description: bytestring < 0.10.4
+  default: False
+  manual:  False
 
 Library
   default-language: Haskell2010
diff --git a/cassava.cabal b/cassava.cabal
index 329f151..d0cedee 100644
--- a/cassava.cabal
+++ b/cassava.cabal
@@ -64,6 +64,8 @@ source-repository head
 
 flag bytestring--LT-0_10_4
   description: [bytestring](https://hackage.haskell.org/haskell/package/bytestring) < 0.10.4
+  default: False
+  manual:  False
 
 Library
   default-language: Haskell2010