diff --git a/Server/DataStructures/BaseDataFacade.h b/Server/DataStructures/BaseDataFacade.h
index 1812789a6..53302b5be 100644
--- a/Server/DataStructures/BaseDataFacade.h
+++ b/Server/DataStructures/BaseDataFacade.h
@@ -98,5 +98,4 @@ public:
     ) const = 0;
 };
 
-
 #endif // QUERY_DATA_FACADE_H
diff --git a/Server/DataStructures/InternalDataFacade.h b/Server/DataStructures/InternalDataFacade.h
index 80c4d6ffb..fd006bc5b 100644
--- a/Server/DataStructures/InternalDataFacade.h
+++ b/Server/DataStructures/InternalDataFacade.h
@@ -21,8 +21,12 @@ or see http://www.gnu.org/licenses/agpl.txt.
 #ifndef INTERNAL_DATA_FACADE
 #define INTERNAL_DATA_FACADE
 
+//implements all data storage when shared memory is _NOT_ used
+
 #include "BaseDataFacade.h"
 
+#include "../../DataStructures/StaticGraph.h"
+
 template<class EdgeDataT>
 class InternalDataFacade : public BaseDataFacade<EdgeDataT> {
 
diff --git a/Server/DataStructures/SharedDataFacade.h b/Server/DataStructures/SharedDataFacade.h
index 4f3bc8880..4a23919b6 100644
--- a/Server/DataStructures/SharedDataFacade.h
+++ b/Server/DataStructures/SharedDataFacade.h
@@ -21,8 +21,12 @@ or see http://www.gnu.org/licenses/agpl.txt.
 #ifndef INTERNAL_DATA_FACADE
 #define INTERNAL_DATA_FACADE
 
+//implements all data storage when shared memory is _NOT_ used
+
 #include "BaseDataFacade.h"
 
+#include "../../DataStructures/StaticGraph.h"
+
 template<class EdgeDataT>
 class SharedDataFacade : public BaseDataFacade<EdgeDataT> {