diff --git a/briar-core/src/main/java/org/briarproject/briar/socialbackup/recovery/CustodianTaskImpl.java b/briar-core/src/main/java/org/briarproject/briar/socialbackup/recovery/CustodianTaskImpl.java
index 197b1f015..af89bde8b 100644
--- a/briar-core/src/main/java/org/briarproject/briar/socialbackup/recovery/CustodianTaskImpl.java
+++ b/briar-core/src/main/java/org/briarproject/briar/socialbackup/recovery/CustodianTaskImpl.java
@@ -1,4 +1,15 @@
 package org.briarproject.briar.socialbackup.recovery;
 
-public class CustodianTaskImpl {
+import org.briarproject.briar.api.socialbackup.recovery.CustodianTask;
+
+public class CustodianTaskImpl implements CustodianTask {
+	@Override
+	public void start(Observer observer) {
+
+	}
+
+	@Override
+	public void cancel() {
+
+	}
 }