diff --git a/code/StepExporter.cpp b/code/StepExporter.cpp
index e609ae821..a8fca4613 100644
--- a/code/StepExporter.cpp
+++ b/code/StepExporter.cpp
@@ -39,13 +39,13 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ----------------------------------------------------------------------
 */
 
-#include "AssimpPCH.h"
 
 #ifndef ASSIMP_BUILD_NO_EXPORT
 #ifndef ASSIMP_BUILD_NO_STEP_EXPORTER
 #include "StepExporter.h"
 #include "ConvertToLHProcess.h"
 #include "Bitmap.h"
+#include "BaseImporter.h"
 #include "fast_atof.h"
 #include "SceneCombiner.h" 
 
@@ -53,6 +53,11 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <set>
 #include <map>
 #include <list>
+#include <boost/scoped_ptr.hpp>
+#include "Exceptional.h"
+#include "../include/assimp/IOSystem.hpp"
+#include "../include/assimp/scene.h"
+#include "../include/assimp/light.h"
 
 /* Tested with Step viewer v4 from www.ida-step.net */
 
diff --git a/code/StepExporter.h b/code/StepExporter.h
index 1ff0ab7de..0439bef6f 100644
--- a/code/StepExporter.h
+++ b/code/StepExporter.h
@@ -47,6 +47,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define AI_STEPEXPORTER_H_INC
 
 #include "../include/assimp/ai_assert.h"
+#include "../include/assimp/matrix4x4.h"
+#include "../include/assimp/Exporter.hpp"
 #include <sstream>
 
 struct aiScene;