diff --git a/event.go b/event.go
index 9d605abf..0580835a 100644
--- a/event.go
+++ b/event.go
@@ -65,8 +65,11 @@ const (
 )
 
 func checkID(id, kind string, sigil byte) (err error) {
-	if _, err = domainFromID(id); err != nil {
-		return
+	if kind != "room" {
+		// RoomIDs should always be an opaque string, so only do this check for other kinds of ID
+		if _, err = domainFromID(id); err != nil {
+			return
+		}
 	}
 	if id[0] != sigil {
 		err = fmt.Errorf(