diff --git a/autotest/t505_test.py b/autotest/t505_test.py
index 8f3be94b5..018a1df69 100644
--- a/autotest/t505_test.py
+++ b/autotest/t505_test.py
@@ -505,9 +505,31 @@ def test021_twri():
                              scaling_method='NONE', reordering_method='NONE',
                              relaxation_factor=0.97)
     sim.register_ims_package(ims_package, [model.name])
+    # build top binary data
+    text = 'TOP'
+    fname = 'top.bin'
+    nrow = 15
+    ncol = 15
+    pth = os.path.join(sim.simulation_data.mfpath.get_sim_path(), fname)
+    f = open(pth, 'wb')
+    header = flopy.utils.BinaryHeader.create(bintype='HEAD',
+                                             precision='double',
+                                             text=text,
+                                             nrow=nrow,
+                                             ncol=ncol,
+                                             ilay=1, pertim=1.0,
+                                             totim=1.0, kstp=1,
+                                             kper=1)
+    flopy.utils.Util2d.write_bin((nrow, ncol), f,
+                                 np.full((nrow, ncol), 200.0,
+                                 dtype=np.float64), header_data=header)
+    f.close()
+    top = {'factor': 1., 'filename': fname, 'data': None, 'binary': True,
+           'iprn': 1}
+
     dis_package = flopy.mf6.ModflowGwfdis(model, nlay=3, nrow=15, ncol=15,
                                           delr=5000.0, delc=5000.0,
-                                          top=200.0, botm=[-200, -300, -450],
+                                          top=top, botm=[-200, -300, -450],
                                           filename='{}.dis'.format(model_name))
     strt = [{'filename': 'strt.txt', 'factor': 1.0, 'data': 0.0},
             {'filename': 'strt2.bin', 'factor': 1.0, 'data': 1.0,
diff --git a/flopy/mf6/data/mfdatastorage.py b/flopy/mf6/data/mfdatastorage.py
index e95eb8316..eb1337149 100644
--- a/flopy/mf6/data/mfdatastorage.py
+++ b/flopy/mf6/data/mfdatastorage.py
@@ -1626,7 +1626,7 @@ def _build_full_data(self, apply_multiplier=False):
                         read_file, self.get_data_dimensions(layer),
                         self.get_data_size(layer), self._data_type,
                         self._model_or_sim.modeldiscrit,
-                        not self.layered)[0] * mult
+                        False)[0] * mult
                 else:
                     data_out = file_access.read_text_data_from_file(
                         self.get_data_size(layer), np_data_type,