diff --git a/fdfd_tools/vectorization.py b/fdfd_tools/vectorization.py
index 2377d39..1c2134a 100644
--- a/fdfd_tools/vectorization.py
+++ b/fdfd_tools/vectorization.py
@@ -27,7 +27,7 @@ def vec(f: field_t) -> vfield_t:
     """
     if numpy.any(numpy.equal(f, None)):
         return None
-    return numpy.hstack(tuple((fi.flatten(order='C') for fi in f)))
+    return numpy.hstack(tuple((fi.ravel(order='C') for fi in f)))
 
 
 def unvec(v: vfield_t, shape: numpy.ndarray) -> field_t: