diff --git a/cmp/stages/diffusion/reconstruction.py b/cmp/stages/diffusion/reconstruction.py
index 38c44ed..d9090d6 100644
--- a/cmp/stages/diffusion/reconstruction.py
+++ b/cmp/stages/diffusion/reconstruction.py
@@ -491,7 +491,7 @@ def create_mrtrix_recon_flow(config):
     if config.local_model:
         # Compute single fiber voxel mask
         mrtrix_erode = pe.Node(interface=mrtrix.Erode(),name="mrtrix_erode")
-        mrtrix_erode.inputs.number_of_passes = 3
+        mrtrix_erode.inputs.number_of_passes = 1
         mrtrix_mul_eroded_FA = pe.Node(interface=MRtrix_mul(),name='mrtrix_mul_eroded_FA')
         mrtrix_mul_eroded_FA.inputs.out_filename = "diffusion_resampled_tensor_FA_masked.mif"
         mrtrix_thr_FA = pe.Node(interface=mrtrix.Threshold(),name='mrtrix_thr')
@@ -772,4 +772,4 @@ def create_gibbs_recon_flow(config):
                   (inputnode,gibbs_node,[("diffusion_resampled","dwi")]),
                   (gibbs_node,outputnode,[("recon_file","recon_file")])
                 ])
-    return flow
\ No newline at end of file
+    return flow