diff --git a/modules/local/rmats_prep_single.nf b/modules/local/rmats_prep_single.nf
index cf52b37..4373796 100644
--- a/modules/local/rmats_prep_single.nf
+++ b/modules/local/rmats_prep_single.nf
@@ -57,7 +57,7 @@ process RMATS_PREP_SINGLE {
 
     """
     rmats.py \\
-        --b1 $bam_group1 \\
+        --b1 $bam1 \\
         -t $read_type \\
         --libType $strandedness \\
         --nthread $task.cpus \\