diff --git a/src/engine/tests/system/gt_data/virus_replication/virus_replication.mo b/src/engine/tests/system/gt_data/virus_replication/virus_replication.mo
index 95faae30..eedbd0c7 100644
--- a/src/engine/tests/system/gt_data/virus_replication/virus_replication.mo
+++ b/src/engine/tests/system/gt_data/virus_replication/virus_replication.mo
@@ -49,6 +49,7 @@ end for;
 	experiment(
 		MMO_Description="",
 		MMO_Solver=QSS,
+		MMO_SymDiff=false,
 		MMO_Period={100/1000},
 		MMO_PartitionMethod=Metis,
 		MMO_Output={X},