diff --git a/nextflow.config b/nextflow.config
index 93dd7cd..eb58592 100644
--- a/nextflow.config
+++ b/nextflow.config
@@ -98,7 +98,12 @@ profiles {
 
     cbrain {
       process{
-        publishDir = [path: {"./results_rbx/$sid/$task.process"}, mode: 'copy']
-      }
+        if(params.output_dir) {
+          publishDir = [path: {"$params.output_dir/$sid/$task.process"}, mode: 'copy']
+        }
+        else{
+          publishDir = [path: {"./results_tractometry/$sid/$task.process"}, mode: 'copy']
+        }
+    }
     }
 }