diff --git a/briar-api/src/main/java/org/briarproject/briar/api/socialbackup/SocialBackupManager.java b/briar-api/src/main/java/org/briarproject/briar/api/socialbackup/SocialBackupManager.java
index acab2eac1..dfdb6154c 100644
--- a/briar-api/src/main/java/org/briarproject/briar/api/socialbackup/SocialBackupManager.java
+++ b/briar-api/src/main/java/org/briarproject/briar/api/socialbackup/SocialBackupManager.java
@@ -5,7 +5,9 @@ import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.ClientId;
+import org.briarproject.briar.api.conversation.ConversationMessageHeader;
 
+import java.util.Collection;
 import java.util.List;
 
 import javax.annotation.Nullable;
@@ -44,4 +46,7 @@ public interface SocialBackupManager {
 	 */
 	void createBackup(Transaction txn, List<ContactId> custodianIds,
 			int threshold) throws DbException;
+
+	Collection<ConversationMessageHeader> getMessageHeaders(
+			Transaction txn, ContactId contactId) throws DbException;
 }