diff --git a/Util/GraphLoader.h b/Util/GraphLoader.h
index 6b664a696..6fdcd3228 100644
--- a/Util/GraphLoader.h
+++ b/Util/GraphLoader.h
@@ -25,6 +25,7 @@ or see http://www.gnu.org/licenses/agpl.txt.
 #include "../DataStructures/ImportEdge.h"
 #include "../DataStructures/NodeCoords.h"
 #include "../DataStructures/Restriction.h"
+#include "../Util/UUID.h"
 #include "../typedefs.h"
 
 #include <boost/assert.hpp>
@@ -50,6 +51,21 @@ struct _ExcessRemover {
 
 template<typename EdgeT>
 NodeID readBinaryOSRMGraphFromStream(std::istream &in, std::vector<EdgeT>& edgeList, std::vector<NodeID> &bollardNodes, std::vector<NodeID> &trafficLightNodes, std::vector<NodeInfo> * int2ExtNodeMap, std::vector<_Restriction> & inputRestrictions) {
+    const UUID uuid_orig;
+    UUID uuid_loaded;
+    in.read((char *) &uuid_loaded, sizeof(UUID));
+    if(!uuid_loaded.IsMagicNumberOK()) {
+        ERR("hsgr input file misses magic number. Check or reprocess the file");
+    }
+
+    if( uuid_loaded.TestHSGR(uuid_orig) ) {
+        WARN(
+            ".hsgr was prepared with different build.\n"
+            "Reprocess to get rid of this warning."
+            )
+    }
+
+
     NodeID n, source, target;
     EdgeID m;
     short dir;// direction (0 = open, 1 = forward, 2+ = open)
diff --git a/Util/UUID.cpp.in b/Util/UUID.cpp.in
index 621c59cfc..c5b522af7 100644
--- a/Util/UUID.cpp.in
+++ b/Util/UUID.cpp.in
@@ -54,3 +54,11 @@ UUID::~UUID() {
 const boost::uuids::uuid & UUID::GetUUID() const {
 	return named_uuid;
 }
+
+const bool UUID::IsMagicNumberOK() const {
+	return 1297240911 == magic_number;
+}
+
+const bool UUID::TestHSGR(const UUID & other) const {
+	return std::equal(md5_graph, md5_graph+32, other.md5_graph);
+}
\ No newline at end of file
diff --git a/Util/UUID.h b/Util/UUID.h
index 5dfce34cf..354540e07 100644
--- a/Util/UUID.h
+++ b/Util/UUID.h
@@ -35,14 +35,12 @@ or see http://www.gnu.org/licenses/agpl.txt.
 //implements a singleton, i.e. there is one and only one conviguration object
 class UUID : boost::noncopyable {
 public:
-	static UUID & GetInstance() {
-		static UUID instance;
-		return instance;
-	}
+    UUID();
 	~UUID();
 	const boost::uuids::uuid & GetUUID() const;
+	const bool IsMagicNumberOK() const;
+	const bool TestHSGR(const UUID & other) const;
 private:
-    UUID();
     const unsigned magic_number;
     char md5_prepare[33];
     char md5_tree[33];