diff --git a/stack-orchestrator/config/fixturenet-eth/fixturenet-eth.env b/stack-orchestrator/config/fixturenet-eth/fixturenet-eth.env
index 9943882..9bd7302 100644
--- a/stack-orchestrator/config/fixturenet-eth/fixturenet-eth.env
+++ b/stack-orchestrator/config/fixturenet-eth/fixturenet-eth.env
@@ -13,6 +13,3 @@ ENR_URL="http://fixturenet-eth-bootnode-lighthouse:3000/bootnode/enr.dat"
 
 CERC_GETH_VMODULE="rpc/*=5"
 CERC_GETH_VERBOSITY=${CERC_GETH_VERBOSITY:-3}
-
-# Used by Lighthouse
-SECONDS_PER_ETH1_BLOCK=${SECONDS_PER_ETH1_BLOCK:-3}