diff --git a/tests/resources/simulation/ipv4_icmp_ooo.yaml b/tests/resources/simulation/ipv4_icmp_ooo.yaml
index 5d53e2473..126f7eac2 100644
--- a/tests/resources/simulation/ipv4_icmp_ooo.yaml
+++ b/tests/resources/simulation/ipv4_icmp_ooo.yaml
@@ -2,6 +2,7 @@ name: IPv4/ICMP with out of order responses
 target: 10.0.0.105
 protocol: Icmp
 icmp_identifier: 4
+grace_period: 300
 hops:
   - ttl: 1
     resp: !SingleHost