diff --git a/CMakeLists.txt b/CMakeLists.txt
index a13939d9..1f2f91d9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -217,6 +217,10 @@ IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
     ENDIF ()
 ENDIF ()
 
+IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC90" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC10")
+    SET_SOURCE_FILES_PROPERTIES(${msgpack_SOURCES} PROPERTIES LANGUAGE CXX)
+ENDIF()
+
 IF (NOT DEFINED CMAKE_INSTALL_LIBDIR)
     SET(CMAKE_INSTALL_LIBDIR lib)
 ENDIF ()