diff --git a/nibabel/brikhead.py b/nibabel/brikhead.py
index da8692efd..d187a6b34 100644
--- a/nibabel/brikhead.py
+++ b/nibabel/brikhead.py
@@ -198,7 +198,7 @@ def parse_AFNI_header(fobj):
             return parse_AFNI_header(src)
     # unpack variables in HEAD file
     head = fobj.read().split('\n\n')
-    return {key: value for key, value in map(_unpack_var, head)}
+    return dict(map(_unpack_var, head))
 
 
 class AFNIArrayProxy(ArrayProxy):
diff --git a/nibabel/nicom/dicomwrappers.py b/nibabel/nicom/dicomwrappers.py
index 3842248fd..009880e49 100755
--- a/nibabel/nicom/dicomwrappers.py
+++ b/nibabel/nicom/dicomwrappers.py
@@ -685,9 +685,7 @@ def __init__(self, dcm_data, frame_filters=None):
             frame_slc_pos = [np.inner(ipp, self.slice_normal) for ipp in frame_ipps]
             rnd_slc_pos = np.round(frame_slc_pos, 4)
             uniq_slc_pos = np.unique(rnd_slc_pos)
-            pos_ord_map = {
-                val: order for val, order in zip(uniq_slc_pos, np.argsort(uniq_slc_pos))
-            }
+            pos_ord_map = dict(zip(uniq_slc_pos, np.argsort(uniq_slc_pos)))
             self._frame_slc_ord = [pos_ord_map[pos] for pos in rnd_slc_pos]
             if len(self._frame_slc_ord) > 1:
                 self._slice_spacing = (