diff --git a/Jamfile b/Jamfile
index ddae14729..490d80dcb 100644
--- a/Jamfile
+++ b/Jamfile
@@ -328,7 +328,7 @@ rule building ( properties * )
 
 	if <encryption>on in $(properties)
 	{
-		result += <source>src/mpi.c ;
+		result += <source>src/mpi.cpp ;
 		result += <source>src/pe_crypto.cpp ;
 	}
 
diff --git a/src/Makefile.am b/src/Makefile.am
index d2ff91f79..4c3496ad1 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -86,7 +86,7 @@ libtorrent_rasterbar_la_SOURCES = \
   magnet_uri.cpp                  \
   merkle.cpp                      \
   metadata_transfer.cpp           \
-  mpi.c                           \
+  mpi.cpp                         \
   natpmp.cpp                      \
   parse_url.cpp                   \
   part_file.cpp                   \
diff --git a/src/mpi.c b/src/mpi.cpp
similarity index 99%
rename from src/mpi.c
rename to src/mpi.cpp
index 1153e5d47..b8104f88e 100644
--- a/src/mpi.c
+++ b/src/mpi.cpp
@@ -1,3 +1,5 @@
+#include "libtorrent/aux_/disable_warnings_push.hpp"
+
 /* Start: bn_error.c */
 #include "libtorrent/tommath_private.h"
 #ifdef BN_ERROR_C