diff --git a/Code/Mantid/Framework/Geometry/inc/MantidGeometry/Instrument/InstrumentDefinitionParser.h b/Code/Mantid/Framework/Geometry/inc/MantidGeometry/Instrument/InstrumentDefinitionParser.h
index 9c90b88a31d5..3d2749435c06 100644
--- a/Code/Mantid/Framework/Geometry/inc/MantidGeometry/Instrument/InstrumentDefinitionParser.h
+++ b/Code/Mantid/Framework/Geometry/inc/MantidGeometry/Instrument/InstrumentDefinitionParser.h
@@ -4,6 +4,7 @@
 #include <string>
 #include <vector>
 #include <Poco/AutoPtr.h>
+#include <Poco/DOM/Document.h>
 #include "MantidKernel/System.h"
 #include "MantidKernel/Logger.h"
 #include "MantidKernel/V3D.h"
@@ -14,7 +15,6 @@ namespace Poco
 {
 namespace XML
 {
-  class Document;
   class Element;
 }
 }
diff --git a/Code/Mantid/Framework/Geometry/test/InstrumentDefinitionParserTest.h b/Code/Mantid/Framework/Geometry/test/InstrumentDefinitionParserTest.h
index 0f4830d85851..e5a3e0f6c8a4 100644
--- a/Code/Mantid/Framework/Geometry/test/InstrumentDefinitionParserTest.h
+++ b/Code/Mantid/Framework/Geometry/test/InstrumentDefinitionParserTest.h
@@ -2,7 +2,6 @@
 #define MANTID_GEOMETRY_INSTRUMENTDEFINITIONPARSERTEST_H_
 
 #include <cxxtest/TestSuite.h>
-#include <Poco/DOM/Document.h>
 #include "MantidGeometry/Instrument/InstrumentDefinitionParser.h"
 #include "MantidKernel/ConfigService.h"
 #include "MantidKernel/Strings.h"