diff --git a/ouroboros-consensus-diffusion/src/ouroboros-consensus-diffusion/Ouroboros/Consensus/Node.hs b/ouroboros-consensus-diffusion/src/ouroboros-consensus-diffusion/Ouroboros/Consensus/Node.hs
index 4fd56d6581..b59a9d7dc9 100644
--- a/ouroboros-consensus-diffusion/src/ouroboros-consensus-diffusion/Ouroboros/Consensus/Node.hs
+++ b/ouroboros-consensus-diffusion/src/ouroboros-consensus-diffusion/Ouroboros/Consensus/Node.hs
@@ -740,6 +740,7 @@ stdChainSyncTimeout = do
       { canAwaitTimeout  = shortWait
       , intersectTimeout = shortWait
       , mustReplyTimeout
+      , idleTimeout      = Just 3673
       }
 
 stdVersionDataNTN :: NetworkMagic
diff --git a/ouroboros-consensus-diffusion/src/unstable-diffusion-testlib/Test/ThreadNet/Network.hs b/ouroboros-consensus-diffusion/src/unstable-diffusion-testlib/Test/ThreadNet/Network.hs
index 5283414396..e8543daa1d 100644
--- a/ouroboros-consensus-diffusion/src/unstable-diffusion-testlib/Test/ThreadNet/Network.hs
+++ b/ouroboros-consensus-diffusion/src/unstable-diffusion-testlib/Test/ThreadNet/Network.hs
@@ -1014,6 +1014,7 @@ runThreadNetwork systemTime ThreadNetworkArgs
                      { canAwaitTimeout  = waitForever
                      , intersectTimeout = waitForever
                      , mustReplyTimeout = waitForever
+                     , idleTimeout      = waitForever
                      })
                   nullMetric
                   -- The purpose of this test is not testing protocols, so