diff --git a/src/main/java/org/olat/repository/controllers/RepositorySearchController.java b/src/main/java/org/olat/repository/controllers/RepositorySearchController.java
index 0633f992c57f8e31092dd9f20a65250fa29556b3..4534ccb959151d3d4bcf449967630d064f9a842e 100644
--- a/src/main/java/org/olat/repository/controllers/RepositorySearchController.java
+++ b/src/main/java/org/olat/repository/controllers/RepositorySearchController.java
@@ -459,7 +459,7 @@ public class RepositorySearchController extends BasicController implements Activ
 		displaySearchResults(ureq);
 	}
 
-	private void doSearchById(Long id, Set<String> restrictedTypes) {
+	private void doSearchById(Long id, Collection<String> restrictedTypes) {
 		RepositoryManager rm = RepositoryManager.getInstance();
 		RepositoryEntry entry = rm.lookupRepositoryEntry(id);
 		List<RepositoryEntry> entries = new ArrayList<RepositoryEntry>(1);