diff --git a/src/cmap/_external.py b/src/cmap/_external.py
index b9f8d5213..68a5bd8ce 100644
--- a/src/cmap/_external.py
+++ b/src/cmap/_external.py
@@ -87,10 +87,10 @@ def to_plotly(cm: Colormap) -> list[list[float | str]]:
 def _napari_colormap_param_names() -> set[str]:
     from napari.utils.colormaps import Colormap
 
-    if hasattr(Colormap, "__fields__"):
-        return set(Colormap.__fields__)
-    elif hasattr(Colormap, "model_fields"):
+    if hasattr(Colormap, "model_fields"):
         return set(Colormap.model_fields)
+    elif hasattr(Colormap, "__fields__"):
+        return set(Colormap.__fields__)
     return set()
 
 
diff --git a/tests/test_third_party.py b/tests/test_third_party.py
index c07c0cb4b..a161dac75 100644
--- a/tests/test_third_party.py
+++ b/tests/test_third_party.py
@@ -73,6 +73,15 @@ def test_napari(qapp: "QApplication") -> None:
     v.close()
 
 
+def test_napari_no_deprecated_field_access() -> None:
+    pytest.importorskip("napari")
+    from cmap._external import _napari_colormap_param_names
+
+    # the names are cached, so an earlier conversion may already have paid the warning
+    _napari_colormap_param_names.cache_clear()
+    assert CMAP.to_napari() is not None
+
+
 @pytest.mark.filterwarnings("ignore")
 def test_napari_extreme_colors() -> None:
     # nan_color/low_color/high_color were added in napari 0.6.1