diff --git a/field.py b/field.py
index 6274de513877769c4811ca8d39fb9ed75e526020..4c52bb193288ab04c2581285afb20f388773c0f7 100644
--- a/field.py
+++ b/field.py
@@ -83,9 +83,9 @@ class Field:
                        the outer loop loops over dimension 2, the second outer over dimension 1, and the inner loop
                        over dimension 0. Also allowed: the strings 'numpy' (0,1,..d) or 'reverseNumpy' (d, ..., 1, 0)
         """
-        if layout == 'numpy' or layout == 'C':
+        if layout == 'numpy' or layout.lower() == 'c':
             layout = tuple(range(spatialDimensions))
-        elif layout == 'reverseNumpy' or layout == 'F':
+        elif layout == 'reverseNumpy' or layout.lower() == 'f':
             layout = tuple(reversed(range(spatialDimensions)))
         if len(layout) != spatialDimensions:
             raise ValueError("Layout")