diff --git a/5_reconstruction/GtAssembleVol3D.m b/5_reconstruction/GtAssembleVol3D.m
index 9f58259cf9ca820d11b8b606136d60c294415d74..9cb2398bbff8e2492f351de7c5ae75f3099f593d 100644
--- a/5_reconstruction/GtAssembleVol3D.m
+++ b/5_reconstruction/GtAssembleVol3D.m
@@ -652,7 +652,7 @@ classdef GtAssembleVol3D < handle
             % need to search symmetry equivelents for the minimum misorientation
             rot_offset = zeros(1, 24);
 
-            for k = 1:length(symm)
+            for k = 1:length(obj.symm)
                 g1equiv = g1 * obj.symm(k).g3;
                 netg = g1equiv \ g2;
                 rot_offset(k) = sum(diag(netg));