diff --git a/src/proc/mobject/session/session-interface-modules.hpp b/src/proc/mobject/session/session-interface-modules.hpp
index 09e0a656a..3651ee3b8 100644
--- a/src/proc/mobject/session/session-interface-modules.hpp
+++ b/src/proc/mobject/session/session-interface-modules.hpp
@@ -99,9 +99,23 @@ namespace session {
       ElementQuery elementQueryAPI_;
       TimelineTracker timelineRegistry_;
       SequenceTracker sequenceRegistry_;
+      
+      SessionInterfaceModules();
     };
   
   
   
+  
+  /** init element-tracking mechanism for
+   *  timelines and sequences on session creation
+   */
+  inline 
+  SessionInterfaceModules::SessionInterfaceModules()
+  {
+    asset::Timeline::setRegistryInstance (timelineRegistry_);
+    asset::Sequence::setRegistryInstance (sequenceRegistry_);
+  }
+  
+  
 }} // namespace mobject::session
 #endif
diff --git a/tests/components/proc/mobject/session/session-element-tracker-test.cpp b/tests/components/proc/mobject/session/session-element-tracker-test.cpp
index d7d9e8501..10a333b1e 100644
--- a/tests/components/proc/mobject/session/session-element-tracker-test.cpp
+++ b/tests/components/proc/mobject/session/session-element-tracker-test.cpp
@@ -24,7 +24,6 @@
 #include "lib/test/run.hpp"
 
 #include "lib/element-tracker.hpp"
-#include "proc/mobject/session/session-interface-modules.hpp"
 
 #include "proc/assetmanager.hpp"
 #include "proc/mobject/session.hpp"