diff --git a/python/damask/grid_filters.py b/python/damask/grid_filters.py
index d8b136a6b..4181cb7ec 100644
--- a/python/damask/grid_filters.py
+++ b/python/damask/grid_filters.py
@@ -211,12 +211,13 @@ def cell_coord0_gridSizeOrigin(coord0,ordered=True):
     start = origin + delta*.5
     end   = origin - delta*.5 + size
 
-    if not _np.allclose(coords[0],_np.linspace(start[0],end[0],grid[0])) and \
-           _np.allclose(coords[1],_np.linspace(start[1],end[1],grid[1])) and \
-           _np.allclose(coords[2],_np.linspace(start[2],end[2],grid[2])):
+    atol = 1e-4*_np.max(size)
+    if not _np.allclose(coords[0],_np.linspace(start[0],end[0],grid[0]),atol=atol) and \
+           _np.allclose(coords[1],_np.linspace(start[1],end[1],grid[1]),atol=atol) and \
+           _np.allclose(coords[2],_np.linspace(start[2],end[2],grid[2]),atol=atol):
         raise ValueError('Regular grid spacing violated.')
 
-    if ordered and not _np.allclose(coord0.reshape(tuple(grid[::-1])+(3,)),cell_coord0(grid,size,origin)):
+    if ordered and not _np.allclose(coord0.reshape(tuple(grid[::-1])+(3,)),cell_coord0(grid,size,origin),atol=atol):
         raise ValueError('Input data is not a regular grid.')
 
     return (grid,size,origin)
@@ -357,12 +358,13 @@ def node_coord0_gridSizeOrigin(coord0,ordered=False):
     if (grid+1).prod() != len(coord0):
         raise ValueError('Data count {} does not match grid {}.'.format(len(coord0),grid))
 
-    if not _np.allclose(coords[0],_np.linspace(mincorner[0],maxcorner[0],grid[0]+1)) and \
-           _np.allclose(coords[1],_np.linspace(mincorner[1],maxcorner[1],grid[1]+1)) and \
-           _np.allclose(coords[2],_np.linspace(mincorner[2],maxcorner[2],grid[2]+1)):
+    atol = _np.max(size)
+    if not _np.allclose(coords[0],_np.linspace(mincorner[0],maxcorner[0],grid[0]+1),atol=atol) and \
+           _np.allclose(coords[1],_np.linspace(mincorner[1],maxcorner[1],grid[1]+1),atol=atol) and \
+           _np.allclose(coords[2],_np.linspace(mincorner[2],maxcorner[2],grid[2]+1),atol=atol):
         raise ValueError('Regular grid spacing violated.')
 
-    if ordered and not _np.allclose(coord0.reshape(tuple((grid+1)[::-1])+(3,)),node_coord0(grid,size,origin)):
+    if ordered and not _np.allclose(coord0.reshape(tuple((grid+1)[::-1])+(3,)),node_coord0(grid,size,origin),atol=atol):
         raise ValueError('Input data is not a regular grid.')
 
     return (grid,size,origin)