diff --git a/src/App/Document.cpp b/src/App/Document.cpp
index 083437bd9..5ccde012e 100644
--- a/src/App/Document.cpp
+++ b/src/App/Document.cpp
@@ -1090,24 +1090,25 @@ std::vector<App::DocumentObject*> Document::getInList(const DocumentObject* me)
     return result;
 }
 
-
-void Document::_rebuildDependencyList(void){
-
+void Document::_rebuildDependencyList(void)
+{
+    d->VertexObjectList.clear();
+    d->DepList.clear();
     // Filling up the adjacency List
-    for (std::map<std::string,DocumentObject*>::const_iterator It = d->objectMap.begin(); It != d->objectMap.end();++It)
+    for (std::map<std::string,DocumentObject*>::const_iterator It = d->objectMap.begin(); It != d->objectMap.end();++It) {
         // add the object as Vertex and remember the index
         d->VertexObjectList[It->second] = add_vertex(d->DepList);
+    }
     // add the edges
     for (std::map<std::string,DocumentObject*>::const_iterator It = d->objectMap.begin(); It != d->objectMap.end();++It) {
         std::vector<DocumentObject*> OutList = It->second->getOutList();
-        for (std::vector<DocumentObject*>::const_iterator It2=OutList.begin();It2!=OutList.end();++It2)
+        for (std::vector<DocumentObject*>::const_iterator It2=OutList.begin();It2!=OutList.end();++It2) {
             if (*It2)
                 add_edge(d->VertexObjectList[It->second],d->VertexObjectList[*It2],d->DepList);
+        }
     }
-
 }
 
-
 void Document::recompute()
 {
     // delete recompute log
@@ -1115,7 +1116,7 @@ void Document::recompute()
         delete *it;
     _RecomputeLog.clear();
 
-    // updates the depency graph
+    // updates the dependency graph
     _rebuildDependencyList();
 
     //DependencyList DepList;