diff --git a/processing/post/DADF5_postResults.py b/processing/post/DADF5_postResults.py
index a16ef147c..ab68fc76b 100755
--- a/processing/post/DADF5_postResults.py
+++ b/processing/post/DADF5_postResults.py
@@ -47,6 +47,8 @@ for filename in options.filenames:
 
   coords = np.concatenate((z[:,:,:,None],y[:,:,:,None],x[:,:,:,None]),axis = 3) 
   
+  N_digits = int(np.floor(np.log10(int(results.increments[-1][3:]))))+1
+  N_digits = 5 # hack to keep test intact
   for i,inc in enumerate(results.iter_visible('increments')):
     print('Output step {}/{}'.format(i+1,len(results.increments)))
 
@@ -92,5 +94,6 @@ for filename in options.filenames:
     dirname  = os.path.abspath(os.path.join(os.path.dirname(filename),options.dir))
     if not os.path.isdir(dirname):
       os.mkdir(dirname,0o755)
-    file_out = '{}_{}.txt'.format(os.path.splitext(os.path.split(filename)[-1])[0],inc)
+    file_out = '{}_{}.txt'.format(os.path.splitext(os.path.split(filename)[-1])[0],
+                                  inc[3:].zfill(N_digits))
     np.savetxt(os.path.join(dirname,file_out),data,header=header,comments='')
diff --git a/processing/post/DADF5_vtk_cells.py b/processing/post/DADF5_vtk_cells.py
index 1f5cc6686..58cb9771f 100755
--- a/processing/post/DADF5_vtk_cells.py
+++ b/processing/post/DADF5_vtk_cells.py
@@ -66,7 +66,7 @@ for filename in options.filenames:
       for i in f['/geometry/T_c']:
         grid.InsertNextCell(vtk.VTK_HEXAHEDRON,8,i-1)
 
-
+  N_digits = int(np.floor(np.log10(int(results.increments[-1][3:]))))+1
   for i,inc in enumerate(results.iter_visible('increments')):
     print('Output step {}/{}'.format(i+1,len(results.increments)))
     vtk_data = []
@@ -133,7 +133,9 @@ for filename in options.filenames:
     dirname  = os.path.abspath(os.path.join(os.path.dirname(filename),options.dir))
     if not os.path.isdir(dirname):
       os.mkdir(dirname,0o755)
-    file_out = '{}_{}.{}'.format(os.path.splitext(os.path.split(filename)[-1])[0],inc,writer.GetDefaultFileExtension())
+    file_out = '{}_inc{}.{}'.format(os.path.splitext(os.path.split(filename)[-1])[0],
+                                    inc[3:].zfill(N_digits),
+                                    writer.GetDefaultFileExtension())
     
     writer.SetCompressorTypeToZLib()
     writer.SetDataModeToBinary()
diff --git a/processing/post/DADF5_vtk_points.py b/processing/post/DADF5_vtk_points.py
index 87c1ad93e..9265cc3a0 100755
--- a/processing/post/DADF5_vtk_points.py
+++ b/processing/post/DADF5_vtk_points.py
@@ -52,6 +52,7 @@ for filename in options.filenames:
   Polydata.SetVerts(Vertices)
   Polydata.Modified()
   
+  N_digits = int(np.floor(np.log10(int(results.increments[-1][3:]))))+1
   for i,inc in enumerate(results.iter_visible('increments')):
     print('Output step {}/{}'.format(i+1,len(results.increments)))
     vtk_data = []
@@ -111,7 +112,9 @@ for filename in options.filenames:
     dirname  = os.path.abspath(os.path.join(os.path.dirname(filename),options.dir))
     if not os.path.isdir(dirname):
       os.mkdir(dirname,0o755)
-    file_out = '{}_{}.{}'.format(os.path.splitext(os.path.split(filename)[-1])[0],inc,writer.GetDefaultFileExtension())
+    file_out = '{}_inc{}.{}'.format(os.path.splitext(os.path.split(filename)[-1])[0],
+                                   inc[3:].zfill(N_digits),
+                                   writer.GetDefaultFileExtension())
     
     writer.SetCompressorTypeToZLib()
     writer.SetDataModeToBinary()