diff --git a/aperoll/widgets/star_plot.py b/aperoll/widgets/star_plot.py
index 3045671..c8f6cc6 100644
--- a/aperoll/widgets/star_plot.py
+++ b/aperoll/widgets/star_plot.py
@@ -740,6 +740,7 @@ def set_catalog(self, catalog):
         if (
             self._catalog is not None
             and (len(self._catalog) == len(catalog))
+            and (self._catalog.dtype == catalog.dtype)
             and np.all(self._catalog == catalog)
         ):
             return