diff --git a/model/sync-ccnx-wrapper.h b/model/sync-ccnx-wrapper.h
index a12848d..fa1356b 100644
--- a/model/sync-ccnx-wrapper.h
+++ b/model/sync-ccnx-wrapper.h
@@ -29,6 +29,7 @@
 #include <ccn/keystore.h>
 #include <ccn/uri.h>
 #include <ccn/bloom.h>
+#include <ccn/signing.h>
 }
 
 #include <boost/thread/recursive_mutex.hpp>