diff --git a/blender/surf.py b/blender/surf.py
index f7a1d21..216a478 100644
--- a/blender/surf.py
+++ b/blender/surf.py
@@ -1,5 +1,4 @@
 import json
-
 import bmesh
 import bpy
 from bpy_extras.io_utils import ExportHelper
@@ -35,30 +34,30 @@ class SMBDumpMesh(bpy.types.Operator, ExportHelper):
         data = {}
         data['vertices'] = [list(vert.co) for vert in b.verts]
 
-        data['edges for vert'] = []
+        data['edges_for_vert'] = []
         for vert in b.verts:
-            data['edges for vert'].append([e.index for e in vert.link_edges])
-        data['faces for vert'] = []
+            data['edges_for_vert'].append([e.index for e in vert.link_edges])
+        data['faces_for_vert'] = []
         for vert in b.verts:
-            data['faces for vert'].append([e.index for e in vert.link_faces])
+            data['faces_for_vert'].append([e.index for e in vert.link_faces])
 
         edges = []
         for edge in b.edges:
             edges.append([v.index for v in edge.verts])
         data['edges'] = edges
 
-        data['faces for edge'] = []
+        data['faces_for_edge'] = []
         for edge in b.edges:
-            data['faces for edge'].append([f.index for f in edge.link_faces])
+            data['faces_for_edge'].append([f.index for f in edge.link_faces])
 
         faces = []
         for face in b.faces:
             faces.append([v.index for v in face.verts])
         data['faces'] = faces
 
-        data['edges for face'] = []
+        data['edges_for_face'] = []
         for face in b.faces:
-            data['edges for face'].append([e.index for e in face.edges])
+            data['edges_for_face'].append([e.index for e in face.edges])
 
         json.dump(data, open(self.filepath, 'w'))
         bpy.ops.object.mode_set(mode='OBJECT')