diff --git a/Eigen/Core b/Eigen/Core
index 5260ce7e8..56005f836 100644
--- a/Eigen/Core
+++ b/Eigen/Core
@@ -93,7 +93,14 @@
     #endif
 
     // include files
-
+    #if (defined __GNUC__) && (defined __MINGW32__)
+      #include <intrin.h>
+      //including intrin.h works around a MINGW bug http://sourceforge.net/tracker/?func=detail&atid=102435&aid=2962480&group_id=2435
+      //in essence, intrin.h is included by windows.h and also declares intrinsics (just as emmintrin.h etc. below do).  However,
+      //intrin.h uses an extern "C" declaration, and g++ thus complains of duplicate declarations with conflicting linkage.  The linkage for intrinsics
+      //doesn't matter, but at that stage the compiler doesn't know; so, to avoid compile errors when windows.h is included after Eigen/Core,
+      //include intrin here.
+    #endif
     #include <emmintrin.h>
     #include <xmmintrin.h>
     #ifdef  EIGEN_VECTORIZE_SSE3