diff --git a/internal/caching/cache_space_rooms.go b/internal/caching/cache_space_rooms.go
index 71b81abcf..6d56cce5f 100644
--- a/internal/caching/cache_space_rooms.go
+++ b/internal/caching/cache_space_rooms.go
@@ -1,11 +1,16 @@
 package caching
 
-import "github.com/matrix-org/gomatrixserverlib"
+import (
+	"time"
+
+	"github.com/matrix-org/gomatrixserverlib"
+)
 
 const (
 	SpaceSummaryRoomsCacheName       = "space_summary_rooms"
 	SpaceSummaryRoomsCacheMaxEntries = 100
 	SpaceSummaryRoomsCacheMutable    = true
+	SpaceSummaryRoomsCacheMaxAge     = time.Minute * 5
 )
 
 type SpaceSummaryRoomsCache interface {
diff --git a/internal/caching/impl_inmemorylru.go b/internal/caching/impl_inmemorylru.go
index c9c8fd08d..94fdd1a9b 100644
--- a/internal/caching/impl_inmemorylru.go
+++ b/internal/caching/impl_inmemorylru.go
@@ -64,6 +64,7 @@ func NewInMemoryLRUCache(enablePrometheus bool) (*Caches, error) {
 		SpaceSummaryRoomsCacheName,
 		SpaceSummaryRoomsCacheMutable,
 		SpaceSummaryRoomsCacheMaxEntries,
+		SpaceSummaryRoomsCacheMaxAge,
 		enablePrometheus,
 	)
 	if err != nil {