diff --git a/changelog.d/437.feature b/changelog.d/437.feature
new file mode 100644
index 00000000..dd281090
--- /dev/null
+++ b/changelog.d/437.feature
@@ -0,0 +1 @@
+Support the stable room type field for [MSC3288](https://github.com/matrix-org/matrix-doc/pull/3288).
diff --git a/sydent/http/servlets/store_invite_servlet.py b/sydent/http/servlets/store_invite_servlet.py
index ada6506a..a344a603 100644
--- a/sydent/http/servlets/store_invite_servlet.py
+++ b/sydent/http/servlets/store_invite_servlet.py
@@ -125,10 +125,12 @@ def render_POST(self, request: Request) -> JsonDict:
         for k in extra_substitutions:
             substitutions.setdefault(k, "")
 
-        # MSC3288
-        substitutions["room_type"] = substitutions.get(
-            "org.matrix.msc3288.room_type", ""
-        )
+        # For MSC3288 room type, prefer the stable field, but fallback to the
+        # unstable field.
+        if "room_type" not in substitutions:
+            substitutions["room_type"] = substitutions.get(
+                "org.matrix.msc3288.room_type", ""
+            )
 
         substitutions["bracketed_verified_sender"] = ""
         if verified_sender: