diff --git a/tests/test_fft.py b/tests/test_fft.py
deleted file mode 100644
index 928f155..0000000
--- a/tests/test_fft.py
+++ /dev/null
@@ -1,9 +0,0 @@
-import numpy as np
-import xdas as xd
-import xdas.fft as xfft
-
-class TestRFFT:
-    def test_with_non_dimensional(self):
-        da = xd.synthetics.wavelet_wavefronts()
-        da["latitude"] = ("distance", np.arange(da.sizes["distance"]))
-        xfft.rfft(da)
diff --git a/tests/test_signal.py b/tests/test_signal.py
index a61dc0d..92b40c5 100644
--- a/tests/test_signal.py
+++ b/tests/test_signal.py
@@ -5,8 +5,6 @@
 import xdas
 import xdas.signal as xp
 from xdas.synthetics import wavelet_wavefronts
-import tempfile
-import os
 
 
 class TestSignal:
diff --git a/xdas/fft.py b/xdas/fft.py
index 2599ae4..3cd3312 100644
--- a/xdas/fft.py
+++ b/xdas/fft.py
@@ -55,7 +55,7 @@ def fft(da, n=None, dim={"last": "spectrum"}, norm=None, parallel=None):
     data = func(da.values)
     coords = {
         newdim if name == olddim else name: f if name == olddim else da.coords[name]
-        for name in da.coords if (da[name].dim != olddim or name == olddim)
+        for name in da.coords
     }
     dims = tuple(newdim if dim == olddim else dim for dim in da.dims)
     return DataArray(data, coords, dims, da.name, da.attrs)
@@ -110,7 +110,7 @@ def rfft(da, n=None, dim={"last": "frequency"}, norm=None, parallel=None):
     data = func(da.values, n, axis, norm)
     coords = {
         newdim if name == olddim else name: f if name == olddim else da.coords[name]
-        for name in da.coords if (da[name].dim != olddim or name == olddim)
+        for name in da.coords
     }
     dims = tuple(newdim if dim == olddim else dim for dim in da.dims)
     return DataArray(data, coords, dims, da.name, da.attrs)