diff --git a/ouroboros-consensus-cardano-tools/test/Main.hs b/ouroboros-consensus-cardano-tools/test/Main.hs
index 927da81cbdc..e31ee705573 100644
--- a/ouroboros-consensus-cardano-tools/test/Main.hs
+++ b/ouroboros-consensus-cardano-tools/test/Main.hs
@@ -94,4 +94,4 @@ main = defaultMain tests
 -- cannot execute binary file: Exec format error
 -- ```
 --
--- 0
+-- 3
diff --git a/ouroboros-consensus-mock-test/test/Main.hs b/ouroboros-consensus-mock-test/test/Main.hs
index 8ac9813c7c4..8c5ea2bcbc9 100644
--- a/ouroboros-consensus-mock-test/test/Main.hs
+++ b/ouroboros-consensus-mock-test/test/Main.hs
@@ -22,3 +22,10 @@ tests =
   , Test.ThreadNet.PBFT.tests
   , Test.ThreadNet.Praos.tests
   ]
+
+-- Counter to address the zfs copy bug on Hydra
+-- ```
+-- cannot execute binary file: Exec format error
+-- ```
+--
+-- 3