diff --git a/impact/storage/utilities.py b/impact/storage/utilities.py
index cda1e57..91f45f3 100644
--- a/impact/storage/utilities.py
+++ b/impact/storage/utilities.py
@@ -325,8 +325,8 @@ def geotransform2bbox(geotransform, columns, rows):
 
 
 def geotransform2resolution(geotransform, isotropic=False,
-                            # FIXME (Ole): Check these tolerances
-                            rtol=1.0e-2, atol=1.0e-5):
+                            # FIXME (Ole): Check these tolerances (issue #173)
+                            rtol=5.0e-2, atol=1.0e-2):
     """Convert geotransform to resolution
 
     Input