diff --git a/visualc/VS2010/mpi_demo.vcxproj b/visualc/VS2010/mpi_demo.vcxproj
index b597b7b..9c225a6 100644
--- a/visualc/VS2010/mpi_demo.vcxproj
+++ b/visualc/VS2010/mpi_demo.vcxproj
@@ -27,7 +27,7 @@
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+    <ProjectGuid>{08A79AF8-5B8A-4343-D01A-B8AB47F3366C}</ProjectGuid>
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