diff --git a/Language/Copilot/Examples/Examples.hs b/Language/Copilot/Examples/Examples.hs
index 3ad0ddf..7171bee 100644
--- a/Language/Copilot/Examples/Examples.hs
+++ b/Language/Copilot/Examples/Examples.hs
@@ -109,7 +109,6 @@ engineMonitor :: Streams
 engineMonitor = do
   -- external vars
   let temp     = extF "temp"
-      cooler   = extB "cooler"
   -- Copilot vars
       temps    = varF "temps"
       overTemp = varB "overTemp"