diff --git a/conf/modules/align_sentieon.config b/conf/modules/align_sentieon.config
index f3fb359f..56b75c26 100644
--- a/conf/modules/align_sentieon.config
+++ b/conf/modules/align_sentieon.config
@@ -19,7 +19,7 @@ process {
 
     withName: '.*ALIGN:ALIGN_SENTIEON:SENTIEON_BWAMEM' {
         ext.args = { "-M -K 10000000 -R ${meta.read_group} " }
-        ext.prefix = { "${meta.id}.sorted" }
+        ext.prefix = { "${meta.id}_sorted" }
     }
 
     withName: '.*ALIGN:ALIGN_SENTIEON:SENTIEON_DATAMETRICS' {