diff --git a/astroquery/mast/observations.py b/astroquery/mast/observations.py
index 963ff6095d..1e79b5b3e0 100644
--- a/astroquery/mast/observations.py
+++ b/astroquery/mast/observations.py
@@ -740,12 +740,12 @@ def download_products(self, products, *, download_dir=None, flat=False,
 
             products = vstack(product_lists)
 
-        # Remove duplicate products
-        products = self._remove_duplicate_products(products)
-
         # apply filters
         products = self.filter_products(products, mrp_only=mrp_only, **filters)
 
+        # remove duplicate products
+        products = self._remove_duplicate_products(products)
+
         if not len(products):
             warnings.warn("No products to download.", NoResultsWarning)
             return