diff --git a/exercises/Pangenome_analysis/panaroo.sh b/exercises/Pangenome_analysis/panaroo.sh
index ae6f9efe8c84e0ab3ba20bac15a2dbeb2e27f0fc..0741f8d669134512be16cd0c6f97657784f1d530 100644
--- a/exercises/Pangenome_analysis/panaroo.sh
+++ b/exercises/Pangenome_analysis/panaroo.sh
@@ -39,5 +39,5 @@ echo Starting panaroo $(date +"%T")
 cd $wd/panaroo
 $singpath/panaroo_1.3.0--pyhdfd78af_0.sif \
 panaroo -i ./annotation_files/*.gff -o ./panaroo_output/ \
---clean-mode strict --remove-invalid-genes --core_threshold 0.95 -t $SLURM_CPUS_PER_TASK
+--clean-mode strict --remove-invalid-genes -a 'core' -t $SLURM_CPUS_PER_TASK
 echo Done $(date +"%T")
\ No newline at end of file