diff --git a/src/stores/widgets/StopGapWidgetDriver.ts b/src/stores/widgets/StopGapWidgetDriver.ts
index aa8721c28e..afd0a85cfc 100644
--- a/src/stores/widgets/StopGapWidgetDriver.ts
+++ b/src/stores/widgets/StopGapWidgetDriver.ts
@@ -190,6 +190,9 @@ export class StopGapWidgetDriver extends WidgetDriver {
                 EventType.Reaction,
                 EventType.RoomRedaction,
                 "io.element.call.reaction",
+                //  MSC4310: Add dev and final event to ease future transition,
+                EventType.RTCDecline,
+                "m.rtc.decline",
             ];
             for (const eventType of [...sendRoomEvents, ...sendRecvRoomEvents])
                 this.allowedCapabilities.add(WidgetEventCapability.forRoomEvent(EventDirection.Send, eventType).raw);
diff --git a/test/unit-tests/stores/widgets/StopGapWidgetDriver-test.ts b/test/unit-tests/stores/widgets/StopGapWidgetDriver-test.ts
index e654cdfea5..d8d115411d 100644
--- a/test/unit-tests/stores/widgets/StopGapWidgetDriver-test.ts
+++ b/test/unit-tests/stores/widgets/StopGapWidgetDriver-test.ts
@@ -134,6 +134,11 @@ describe("StopGapWidgetDriver", () => {
             "org.matrix.msc3819.receive.to_device:m.call.replaces",
             "org.matrix.msc4157.send.delayed_event",
             "org.matrix.msc4157.update_delayed_event",
+            // RTC decline events
+            "org.matrix.msc2762.send.event:org.matrix.msc4310.rtc.decline",
+            "org.matrix.msc2762.receive.event:org.matrix.msc4310.rtc.decline",
+            "org.matrix.msc2762.send.event:m.rtc.decline",
+            "org.matrix.msc2762.receive.event:m.rtc.decline",
         ]);
 
         const approvedCapabilities = await driver.validateCapabilities(requestedCapabilities);