diff --git a/synfig-core/src/synfig/node.cpp b/synfig-core/src/synfig/node.cpp
index 4401f05..a66caf1 100644
--- a/synfig-core/src/synfig/node.cpp
+++ b/synfig-core/src/synfig/node.cpp
@@ -111,7 +111,7 @@ namespace {
 			assert(oldguid);
 			
 			Mutex::Lock lock(mutex);
-			Map::iterator i = map.find(guid);
+			Map::iterator i = map.find(oldguid);
 			assert(i != map.end() && i->second == node);
 			map.erase(i);