diff --git a/datasette/views/row.py b/datasette/views/row.py
index 3fe213d7..ce15a822 100644
--- a/datasette/views/row.py
+++ b/datasette/views/row.py
@@ -165,13 +165,8 @@ class RowView(DataView):
             "primary_key_values": pk_values,
         }
 
-        # Handle _extra parameter (new style)
         extras = _get_extras(request)
 
-        # Also support legacy _extras parameter for backward compatibility
-        if "foreign_key_tables" in (request.args.get("_extras") or "").split(","):
-            extras.add("foreign_key_tables")
-
         # Process extras
         row_extra_context = RowExtraContext(
             datasette=self.ds,
diff --git a/tests/test_api.py b/tests/test_api.py
index e1385b6f..f57d0206 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -383,7 +383,7 @@ async def test_row_strange_table_name(ds_client):
 @pytest.mark.asyncio
 async def test_row_foreign_key_tables(ds_client):
     response = await ds_client.get(
-        "/fixtures/simple_primary_key/1.json?_extras=foreign_key_tables"
+        "/fixtures/simple_primary_key/1.json?_extra=foreign_key_tables"
     )
     assert response.status_code == 200
     # Foreign keys are sorted by (other_table, column, other_column)