diff --git a/CHANGES b/CHANGES
index c69b13e672..933b22cb25 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,7 @@
 Upcoming release (0.14.1)
-================
+=========================
 
+* FIX: Robustly handled outputs of 3dFWHMx across different versions of AFNI (https://github.com/nipy/nipype/pull/2373)
 * FIX: Cluster threshold in randomise + change default prefix (https://github.com/nipy/nipype/pull/2369)
 * MAINT: Cleaning / simplify ``Node`` (https://github.com/nipy/nipype/pull/#2325)
 
diff --git a/nipype/interfaces/afni/utils.py b/nipype/interfaces/afni/utils.py
index 8ddc340858..5b5dc79d7f 100644
--- a/nipype/interfaces/afni/utils.py
+++ b/nipype/interfaces/afni/utils.py
@@ -1315,15 +1315,21 @@ def _list_outputs(self):
             outputs['out_detrend'] = Undefined
 
         sout = np.loadtxt(outputs['out_file'])  #pylint: disable=E1101
+
+        # handle newer versions of AFNI
+        if sout.size == 8:
+            outputs['fwhm'] = tuple(sout[0, :])
+        else:
+            outputs['fwhm'] = tuple(sout)
+
         if self._acf:
+            assert sout.size == 8, "Wrong number of elements in %s" % str(sout)
             outputs['acf_param'] = tuple(sout[1])
-            sout = tuple(sout[0])
 
             outputs['out_acf'] = op.abspath('3dFWHMx.1D')
             if isinstance(self.inputs.acf, (str, bytes)):
                 outputs['out_acf'] = op.abspath(self.inputs.acf)
 
-        outputs['fwhm'] = tuple(sout)
         return outputs