diff --git a/src/libtomahawk/sip/PeerInfo.cpp b/src/libtomahawk/sip/PeerInfo.cpp
index 772f6779a..6630f2501 100644
--- a/src/libtomahawk/sip/PeerInfo.cpp
+++ b/src/libtomahawk/sip/PeerInfo.cpp
@@ -133,6 +133,8 @@ PeerInfo::~PeerInfo()
 void
 PeerInfo::announce()
 {
+    Q_ASSERT( !contactId().isEmpty() );
+
     Servent::instance()->registerPeer( weakRef().toStrongRef() );
 }