diff --git a/visualc/VS2010/mbedTLS.vcxproj b/visualc/VS2010/mbedTLS.vcxproj
index 73c92bd..2ec9178 100644
--- a/visualc/VS2010/mbedTLS.vcxproj
+++ b/visualc/VS2010/mbedTLS.vcxproj
@@ -223,6 +223,7 @@
     <ClInclude Include="..\..\include\mbedtls\x509_crl.h" />
     <ClInclude Include="..\..\include\mbedtls\x509_crt.h" />
     <ClInclude Include="..\..\include\mbedtls\x509_csr.h" />
+    <ClInclude Include="..\..\include\mbedtls\x509_internal.h" />
     <ClInclude Include="..\..\include\mbedtls\xtea.h" />
   </ItemGroup>
   <ItemGroup>