diff --git a/build-constraints.yaml b/build-constraints.yaml
index 0fc698e9..a993d839 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -12,7 +12,7 @@ packages:
     "Allan Lukwago <epicallan.al@gmail.com> @epicallan":
         - servant-errors
 
-    "Christian Charukiewicz <c.charukiewicz@gmail.com> @charukiewicz":
+        "Christian Charukiewicz <c.charukiewicz@gmail.com> @charukiewicz":
         - isbn
 
     "Koz Ross <koz.ross@retro-freedom.nz> @kozross":
@@ -4607,7 +4607,7 @@ packages:
         - special-values
         - splice
         - split
-        - splitmix
+        - splitmix < 0.1 # https://github.com/commercialhaskell/stackage/issues/5399 and and QuickCheck-2.14
         - sql-words
         - stateref
         - statistics