diff --git a/HtmlSanitizer/HtmlSanitizer.csproj b/HtmlSanitizer/HtmlSanitizer.csproj
index bc7e994..8482d18 100644
--- a/HtmlSanitizer/HtmlSanitizer.csproj
+++ b/HtmlSanitizer/HtmlSanitizer.csproj
@@ -9,8 +9,9 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>Html</RootNamespace>
     <AssemblyName>HtmlSanitizer</AssemblyName>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>