diff --git a/Ccs/tools/dataprocessing/smile_raw_ce_converter.py b/Ccs/tools/dataprocessing/smile_raw_ce_converter.py
index 9eccf344be4b4353017232cfaa13e454a736c54e..7a8e256975e823ce263ccc074ebbb79057cfed31 100755
--- a/Ccs/tools/dataprocessing/smile_raw_ce_converter.py
+++ b/Ccs/tools/dataprocessing/smile_raw_ce_converter.py
@@ -99,7 +99,7 @@ def mk_ed(data):
         except:
             print(col, row, 'FAILED')
 
-    nodes[:] = np.nan
+    nodes[nodes == 0] = np.nan
 
     ed_img = _assemble_ft_frames_to_fp_view(nodes)