diff --git a/CHANGES/4450.bugfix b/CHANGES/4450.bugfix
new file mode 100644
index 0000000000..90476b9a18
--- /dev/null
+++ b/CHANGES/4450.bugfix
@@ -0,0 +1 @@
+Added ``format`` param to ``DEFAULT_FILTERS`` in ``BaseFilterSet`` to fix django api format.
diff --git a/pulpcore/filters.py b/pulpcore/filters.py
index b1e4a863ff..3dd6e1591f 100644
--- a/pulpcore/filters.py
+++ b/pulpcore/filters.py
@@ -382,6 +382,7 @@ def is_valid(self, *args, **kwargs):
             "offset",
             "page_size",
             "ordering",
+            "format",
         ]
         for field in self.data.keys():
             if field in DEFAULT_FILTERS: