diff --git a/starlink/ndfpack/Ndf.py b/starlink/ndfpack/Ndf.py
index <HASH>..<HASH> 100644
--- a/starlink/ndfpack/Ndf.py
+++ b/starlink/ndfpack/Ndf.py
@@ -93,7 +93,10 @@ class Ndf(object):
             self.label = indf.label
             self.title = indf.title
             self.units  = indf.units
-            self.wcs = indf.gtwcs()
+            try:
+                self.wcs = indf.gtwcs()
+            except NotImplementedError:
+                self.wcs = None
 
             # Read the axes
             self.axes = []
Storing wcs attribute depends on starlink.Ast being available