diff --git a/src/main/java/de/mbremer/room/RoomResource.java b/src/main/java/de/mbremer/room/RoomResource.java
index 8f9080f..e79fb7b 100644
--- a/src/main/java/de/mbremer/room/RoomResource.java
+++ b/src/main/java/de/mbremer/room/RoomResource.java
@@ -8,6 +8,7 @@ import io.quarkus.qute.Template;
 import io.quarkus.qute.TemplateInstance;
 import io.quarkus.security.identity.SecurityIdentity;
 import org.jboss.logging.Logger;
+import org.jboss.resteasy.annotations.cache.Cache;
 import org.jboss.resteasy.annotations.providers.multipart.MultipartForm;
 
 import javax.annotation.security.RolesAllowed;
@@ -68,6 +69,7 @@ public class RoomResource {
 
   @GET
   @Path("/plan")
+  @Cache(maxAge = 43200) // 12H
   @Produces("image/*")
   public Response getImage(@PathParam("image") String image) {
     byte[] roomplan = imageService.getRoomplan();