diff --git a/arangod/VocBase/collection.cpp b/arangod/VocBase/collection.cpp
index dc41d81c1c..74313e9012 100644
--- a/arangod/VocBase/collection.cpp
+++ b/arangod/VocBase/collection.cpp
@@ -121,6 +121,10 @@ bool TRI_collection_t::IsAllowedName(bool allowSystem, std::string const& name)
 
   return true;
 }
+
+std::string TRI_collection_t::label() const {
+  return _vocbase->name() + " / " + _info.name();
+}
   
 /// @brief updates the parameter info block
 int TRI_collection_t::updateCollectionInfo(TRI_vocbase_t* vocbase,
diff --git a/arangod/VocBase/collection.h b/arangod/VocBase/collection.h
index 47fec51e7c..7964332703 100644
--- a/arangod/VocBase/collection.h
+++ b/arangod/VocBase/collection.h
@@ -321,6 +321,7 @@ struct TRI_collection_t {
   void addIndexFile(std::string const&);
   int removeIndexFile(TRI_idx_iid_t);
   std::string const& path() const { return _path; }
+  std::string label() const;
 
  private:
   /// @brief seal a datafile
@@ -346,6 +347,9 @@ struct TRI_collection_t {
   std::vector<TRI_datafile_t*> _datafiles;   // all datafiles
   std::vector<TRI_datafile_t*> _journals;    // all journals
   std::vector<TRI_datafile_t*> _compactors;  // all compactor files
+  
+  // lock for indexes
+  arangodb::basics::ReadWriteLock _lock;
  private:
   std::vector<std::string> _indexFiles;   // all index filenames
 };
diff --git a/arangod/VocBase/document-collection.cpp b/arangod/VocBase/document-collection.cpp
index 9b38fb79e7..2b91683a2c 100644
--- a/arangod/VocBase/document-collection.cpp
+++ b/arangod/VocBase/document-collection.cpp
@@ -87,7 +87,6 @@ using namespace arangodb::basics;
 
 TRI_document_collection_t::TRI_document_collection_t(TRI_vocbase_t* vocbase)
     : TRI_collection_t(vocbase),
-      _lock(),
       _nextCompactionStartIndex(0),
       _lastCompactionStatus(nullptr),
       _useSecondaryIndexes(true),
@@ -113,10 +112,6 @@ TRI_document_collection_t::~TRI_document_collection_t() {
   delete _keyGenerator;
 }
 
-std::string TRI_document_collection_t::label() const {
-  return _vocbase->name() + " / " + _info.name();
-}
- 
 ////////////////////////////////////////////////////////////////////////////////
 /// @brief update statistics for a collection
 /// note: the write-lock for the collection must be held to call this
diff --git a/arangod/VocBase/document-collection.h b/arangod/VocBase/document-collection.h
index 9fa2736348..db5ddd7001 100644
--- a/arangod/VocBase/document-collection.h
+++ b/arangod/VocBase/document-collection.h
@@ -97,14 +97,6 @@ struct TRI_document_collection_t : public TRI_collection_t {
 
   ~TRI_document_collection_t();
 
-  std::string label() const;
-  
-  // ...........................................................................
-  // this lock protects the indexes and _headers attributes
-  // ...........................................................................
-
-  arangodb::basics::ReadWriteLock _lock;
-
  private:
   arangodb::Mutex _compactionStatusLock;
   size_t _nextCompactionStartIndex;