diff --git a/src/corrgi/alignment.py b/src/corrgi/alignment.py
index 4c4213b..ea8667b 100644
--- a/src/corrgi/alignment.py
+++ b/src/corrgi/alignment.py
@@ -35,7 +35,8 @@ def autocorrelation_alignment(catalog: Catalog) -> PixelAlignment:
         [
             [pix.order, pix.pixel, pix.order, pix.pixel, pix.order, pix.pixel]
             for pix in catalog.get_healpix_pixels()
-        ]
+        ],
+        columns=column_names,
     )
     result_mapping = pd.concat([upper_triangle, diagonal])
     return PixelAlignment(catalog.pixel_tree, result_mapping, PixelAlignmentType.OUTER)
diff --git a/tests/corrgi/test_alignment.py b/tests/corrgi/test_alignment.py
index 8840b44..e4ff359 100644
--- a/tests/corrgi/test_alignment.py
+++ b/tests/corrgi/test_alignment.py
@@ -6,6 +6,7 @@ def test_autocorrelation_alignment(data_catalog_dir):
     data_catalog = hipscat.read_from_hipscat(data_catalog_dir)
     alignment = autocorrelation_alignment(data_catalog)
     assert len(alignment.pixel_mapping) == 28
+    assert len(alignment.pixel_mapping.columns) == 6
 
 
 def test_crosscorrelation_alignment(dr7_lrg_catalog_dir, dr7_lrg_rand_catalog_dir):
@@ -16,3 +17,4 @@ def test_crosscorrelation_alignment(dr7_lrg_catalog_dir, dr7_lrg_rand_catalog_di
     ## dr7_rand_catalog has 22 partitions
     ## 12*21 = 252
     assert len(alignment.pixel_mapping) == 252
+    assert len(alignment.pixel_mapping.columns) == 6