diff --git a/GreenshotOfficePlugin/GreenshotOfficePlugin.csproj b/GreenshotOfficePlugin/GreenshotOfficePlugin.csproj
index 51b7bdf42..fa23955ce 100644
--- a/GreenshotOfficePlugin/GreenshotOfficePlugin.csproj
+++ b/GreenshotOfficePlugin/GreenshotOfficePlugin.csproj
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build">
+<Project ToolsVersion="3.5" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build">
   <PropertyGroup>
     <ProjectGuid>{92599C09-FF29-4ABD-B6E6-C48ECD781BAB}</ProjectGuid>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -14,6 +14,7 @@
     <NoStdLib>False</NoStdLib>
     <WarningLevel>4</WarningLevel>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Platform)' == 'x86' ">
     <PlatformTarget>x86</PlatformTarget>