diff --git a/datasette/facets.py b/datasette/facets.py
index 97ddfa07..7d7bd6d4 100644
--- a/datasette/facets.py
+++ b/datasette/facets.py
@@ -638,6 +638,7 @@ class ManyToManyFacet(Facet):
                             "value": str(row["value"]),
                         },
                         separators=(",", ":"),
+                        sort_keys=True,
                     )
                     selected = ("_through", through) in args
                     if selected:
diff --git a/tests/test_facets.py b/tests/test_facets.py
index d2387d5c..b1037396 100644
--- a/tests/test_facets.py
+++ b/tests/test_facets.py
@@ -344,14 +344,14 @@ async def test_m2m_facet_results(app_client):
                     "value": 2,
                     "label": "Paranormal",
                     "count": 3,
-                    "toggle_url": "http://localhost/?_facet_m2m=attraction_characteristic&_through=%7B%22table%22%3A%22roadside_attraction_characteristics%22%2C%22column%22%3A%22characteristic_id%22%2C%22value%22%3A%222%22%7D",
+                    "toggle_url": "http://localhost/?_facet_m2m=attraction_characteristic&_through=%7B%22column%22%3A%22characteristic_id%22%2C%22table%22%3A%22roadside_attraction_characteristics%22%2C%22value%22%3A%222%22%7D",
                     "selected": False,
                 },
                 {
                     "value": 1,
                     "label": "Museum",
                     "count": 2,
-                    "toggle_url": "http://localhost/?_facet_m2m=attraction_characteristic&_through=%7B%22table%22%3A%22roadside_attraction_characteristics%22%2C%22column%22%3A%22characteristic_id%22%2C%22value%22%3A%221%22%7D",
+                    "toggle_url": "http://localhost/?_facet_m2m=attraction_characteristic&_through=%7B%22column%22%3A%22characteristic_id%22%2C%22table%22%3A%22roadside_attraction_characteristics%22%2C%22value%22%3A%221%22%7D",
                     "selected": False,
                 },
             ],