diff --git a/cardano-api/cardano-api.cabal b/cardano-api/cardano-api.cabal
index 9080ffca3d..2b9de8e739 100644
--- a/cardano-api/cardano-api.cabal
+++ b/cardano-api/cardano-api.cabal
@@ -29,6 +29,9 @@ common project-config
                         -Wredundant-constraints
                         -Wunused-packages
 
+  if impl(ghc < 9)
+    ghc-options:        -Wno-incomplete-patterns
+
 common maybe-unix
   if !os(windows)
      build-depends:    unix