diff --git a/Changes b/Changes
index 19ff68885..cf424e061 100644
--- a/Changes
+++ b/Changes
@@ -5,6 +5,9 @@ indicates the contributor was also the author of the fix; Thanks!
 
 * Verilator 3.84** devel
 
+****  Fix svdpi compile issue on MSVCC, bug571.  [Amir Gonnen]
+
+
 
 * Verilator 3.842 2012/11/03
 
diff --git a/include/vltstd/svdpi.h b/include/vltstd/svdpi.h
index e25c2f7f8..4a8af229f 100644
--- a/include/vltstd/svdpi.h
+++ b/include/vltstd/svdpi.h
@@ -36,18 +36,22 @@ typedef signed __int8 int8_t;
 #endif
 
 /* Use to export a symbol from application */
+#ifndef DPI_DLLISPEC
 #if defined (_MSC_VER)
 #define DPI_DLLISPEC __declspec(dllimport)
 #else
 #define DPI_DLLISPEC
 #endif
+#endif
 
 /* Use to import a symbol into application */
+#ifndef DPI_DLLESPEC
 #if defined (_MSC_VER)
 #define DPI_DLLESPEC __declspec(dllexport)
 #else
 #define DPI_DLLESPEC
 #endif
+#endif
 
 /* Use to mark a function as external */
 #ifndef DPI_EXTERN