diff --git a/src/Mod/Assembly/App/opendcm/core.hpp b/src/Mod/Assembly/App/opendcm/core.hpp
index b30cd8aec..6f6d171df 100644
--- a/src/Mod/Assembly/App/opendcm/core.hpp
+++ b/src/Mod/Assembly/App/opendcm/core.hpp
@@ -21,18 +21,18 @@
 #define DCM_CORE_H
 
 #ifdef _WIN32
-	//warning about to long decoraded names, won't affect the code correctness
-	#pragma warning( disable : 4503 )
-	//warning about changed pod initalising behaviour (boost blank in variant)
-	#pragma warning( disable : 4345 )
+      //warning about to long decoraded names, won't affect the code correctness
+      #pragma warning( disable : 4503 )
+      //warning about changed pod initalising behaviour (boost blank in variant)
+      #pragma warning( disable : 4345 )
 
-	//disable boost concept checks, as some of them have alignment problems which bring msvc to an error
-	//(for example DFSvisitor check in boost::graph::depht_first_search)
-	//this has no runtime effect as these are only compile time checks
-	#include <boost/concept/assert.hpp>
-	#undef BOOST_CONCEPT_ASSERT
-	#define BOOST_CONCEPT_ASSERT(Model)
-	#include <boost/concept_check.hpp>
+      //disable boost concept checks, as some of them have alignment problems which bring msvc to an error
+      //(for example DFSvisitor check in boost::graph::depht_first_search)
+      //this has no runtime effect as these are only compile time checks
+      #include <boost/concept/assert.hpp>
+      #undef BOOST_CONCEPT_ASSERT
+      #define BOOST_CONCEPT_ASSERT(Model)
+      #include <boost/concept_check.hpp>
 
 #endif