diff --git a/Jenkinsfile b/Jenkinsfile
index 6347c42361..798648050c 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -51,6 +51,14 @@ def runStages() {
 						./scripts/launch_local_testnet.sh --testnet 1 --nodes 4 --log-level INFO --disable-htop --data-dir local_testnet1_data --base-port \$(( 9000 + EXECUTOR_NUMBER * 100 )) --base-metrics-port \$(( 8008 + EXECUTOR_NUMBER * 100 )) -- --verify-finalization --stop-at-epoch=5
 						"""
 					}
+					stage("testnet finalization - Miracl/Milagro fallback") {
+						// EXECUTOR_NUMBER will be 0 or 1, since we have 2 executors per Jenkins node
+						sh """#!/bin/bash
+						set -e
+						NIMFLAGS="-d:BLS_FORCE_BACKEND=miracl" ./scripts/launch_local_testnet.sh --testnet 0 --nodes 4 --log-level INFO --disable-htop --data-dir local_testnet0_data --base-port \$(( 9000 + EXECUTOR_NUMBER * 100 )) --base-metrics-port \$(( 8008 + EXECUTOR_NUMBER * 100 )) -- --verify-finalization --stop-at-epoch=5
+						NIMFLAGS="-d:BLS_FORCE_BACKEND=miracl" ./scripts/launch_local_testnet.sh --testnet 1 --nodes 4 --log-level INFO --disable-htop --data-dir local_testnet1_data --base-port \$(( 9000 + EXECUTOR_NUMBER * 100 )) --base-metrics-port \$(( 8008 + EXECUTOR_NUMBER * 100 )) -- --verify-finalization --stop-at-epoch=5
+						"""
+					}
 				}
 			)
 		}
@@ -92,4 +100,3 @@ parallel(
 		}
 	}
 )
-
diff --git a/scripts/launch_local_testnet.sh b/scripts/launch_local_testnet.sh
index 2a1ffa04b9..4c9b29007c 100755
--- a/scripts/launch_local_testnet.sh
+++ b/scripts/launch_local_testnet.sh
@@ -160,7 +160,7 @@ else
 fi
 
 NETWORK_NIM_FLAGS=$(scripts/load-testnet-nim-flags.sh ${NETWORK})
-$MAKE -j2 LOG_LEVEL="${LOG_LEVEL}" NIMFLAGS="-d:insecure -d:testnet_servers_image -d:local_testnet ${NETWORK_NIM_FLAGS}" beacon_node deposit_contract
+$MAKE -j2 LOG_LEVEL="${LOG_LEVEL}" NIMFLAGS="${NIMFLAGS} -d:insecure -d:testnet_servers_image -d:local_testnet ${NETWORK_NIM_FLAGS}" beacon_node deposit_contract
 
 PIDS=""
 WEB3_ARG=""
@@ -347,4 +347,3 @@ else
     exit 1
   fi
 fi
-