diff --git a/src/github.com/matrix-org/dendrite/common/config/appservice.go b/src/github.com/matrix-org/dendrite/common/config/appservice.go
index 26398fa1..4ded7c14 100644
--- a/src/github.com/matrix-org/dendrite/common/config/appservice.go
+++ b/src/github.com/matrix-org/dendrite/common/config/appservice.go
@@ -71,7 +71,7 @@ type ApplicationService struct {
 func (a *ApplicationService) IsInterestedInRoomID(
 	roomID string,
 ) bool {
-	if namespaceSlice, ok := a.NamespaceMap["users"]; ok {
+	if namespaceSlice, ok := a.NamespaceMap["rooms"]; ok {
 		for _, namespace := range namespaceSlice {
 			if namespace.RegexpObject.MatchString(roomID) {
 				return true