diff --git a/build-constraints.yaml b/build-constraints.yaml
index d84e1f0d..91e1b2c5 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1168,7 +1168,7 @@ packages:
     "Juan Pedro Villa Isaza jvilla@stackbuilders.com @jpvillaisaza":
         - inflections
         - twitter-feed
-        
+
     "Sergey Alirzaev <zl29ah@gmail.com>":
         - monad-peel
         - Network-NineP
@@ -1256,6 +1256,9 @@ package-flags:
     cabal-rpm:
         old-locale: false
 
+    NineP:
+        bytestring-in-base: false
+
 # By skipping a test suite, we do not pull in the build dependencies
 skipped-tests:
     - ReadArgs # old version of hspec