diff --git a/fsl/data/atlases.py b/fsl/data/atlases.py
index 2a10b1214c89b092e91d7ec4728408e9f08f3c86..6f45caffe26a52ee867700b379cee802f98cf04b 100644
--- a/fsl/data/atlases.py
+++ b/fsl/data/atlases.py
@@ -599,7 +599,7 @@ class Atlas(fslimage.Image):
         # Even though all the FSL atlases
         # are in MNI152 space, not all of
         # their sform_codes are correctly set
-        self.nibImage.get_header().set_sform(
+        self.nibImage.header.set_sform(
             None, code=constants.NIFTI_XFORM_MNI_152)
 
         self.desc = atlasDesc
diff --git a/fsl/data/image.py b/fsl/data/image.py
index 383f02b63cffd4fc0d7a7ddbc6cd46fe2f005d1c..8a2465d2971710b396b2b947e82661fa7979c02d 100644
--- a/fsl/data/image.py
+++ b/fsl/data/image.py
@@ -1065,7 +1065,7 @@ class Image(Nifti):
             nib.save(self.__nibImage, filename)
             self.__fileobj.close()
             self.__nibImage, self.__fileobj = loadIndexedImageFile(filename)
-            self.header = self.__nibImage.get_header()
+            self.header = self.__nibImage.header
 
             # We have to create a new ImageWrapper
             # instance too, as we have just destroyed