diff --git a/.gitignore b/.gitignore
index 9608ec21..8428f5ac 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,4 +8,3 @@ build
 dist
 .env
 .coverage*
-*.Fits
diff --git a/tests/test_fits.py b/tests/test_fits.py
index 055c0b33..d75b063b 100644
--- a/tests/test_fits.py
+++ b/tests/test_fits.py
@@ -32,14 +32,12 @@ def _test_append(fits, data, names):
 def test_basic_write(tmp_path):
     import fitsio
 
-    d = tmp_path / "sub"
-    d.mkdir()
     filename_gfits = "gfits.fits"  # what GLASS creates
     filename_tfits = "tfits.fits"  # file created on the fly to test against
 
-    with user.write_catalog(d / filename_gfits, ext="CATALOG") as out, fitsio.FITS(
-        d / filename_tfits, "rw", clobber=True
-    ) as myFits:
+    with user.write_catalog(
+        tmp_path / filename_gfits, ext="CATALOG"
+    ) as out, fitsio.FITS(tmp_path / filename_tfits, "rw", clobber=True) as myFits:
         for i in range(0, my_max):
             array = np.arange(i, i + 1, delta)  # array of size 1/delta
             array2 = np.arange(i + 1, i + 2, delta)  # array of size 1/delta
@@ -48,8 +46,8 @@ def test_basic_write(tmp_path):
             names = ["RA", "RB"]
             _test_append(myFits, arrays, names)
 
-    with fitsio.FITS(d / filename_gfits) as g_fits, fitsio.FITS(
-        d / filename_tfits
+    with fitsio.FITS(tmp_path / filename_gfits) as g_fits, fitsio.FITS(
+        tmp_path / filename_tfits
     ) as t_fits:
         glass_data = g_fits[1].read()
         test_data = t_fits[1].read()
@@ -59,11 +57,8 @@ def test_basic_write(tmp_path):
 
 @pytest.mark.skipif(not HAVE_FITSIO, reason="test requires fitsio")
 def test_write_exception(tmp_path):
-    d = tmp_path / "sub"
-    d.mkdir()
-
     try:
-        with user.write_catalog(d / filename, ext="CATALOG") as out:
+        with user.write_catalog(tmp_path / filename, ext="CATALOG") as out:
             for i in range(0, my_max):
                 if i == except_int:
                     raise Exception("Unhandled exception")
@@ -74,7 +69,7 @@ def test_write_exception(tmp_path):
     except Exception:
         import fitsio
 
-        with fitsio.FITS(d / filename) as hdul:
+        with fitsio.FITS(tmp_path / filename) as hdul:
             data = hdul[1].read()
             assert data["RA"].size == except_int / delta
             assert data["RB"].size == except_int / delta
@@ -94,6 +89,6 @@ def test_write_exception(tmp_path):
 def test_out_filename(tmp_path):
     import fitsio
 
-    fits = fitsio.FITS(filename, "rw", clobber=True)
+    fits = fitsio.FITS(tmp_path / filename, "rw", clobber=True)
     writer = user._FitsWriter(fits)
-    assert writer.fits._filename == filename
+    assert writer.fits._filename == f"{tmp_path}/{filename}"