diff --git a/src/Orchard.Tests/Orchard.Framework.Tests.csproj b/src/Orchard.Tests/Orchard.Framework.Tests.csproj
index 0758a2d8bce..db55f2bdfa0 100644
--- a/src/Orchard.Tests/Orchard.Framework.Tests.csproj
+++ b/src/Orchard.Tests/Orchard.Framework.Tests.csproj
@@ -133,7 +133,9 @@
       <HintPath>..\..\lib\sqlce\System.Data.SqlServerCe.dll</HintPath>
       <Private>True</Private>
     </Reference>
-    <Reference Include="System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
+    <Reference Include="System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+      <Private>true</Private>
+    </Reference>
     <Reference Include="System.Net.Http.Formatting, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <HintPath>..\packages\Microsoft.AspNet.WebApi.Client.5.2.7\lib\net45\System.Net.Http.Formatting.dll</HintPath>
     </Reference>
diff --git a/src/Orchard.Web/Modules/Orchard.Workflows/Orchard.Workflows.csproj b/src/Orchard.Web/Modules/Orchard.Workflows/Orchard.Workflows.csproj
index 7ee84ed835e..cf693c24f1c 100644
--- a/src/Orchard.Web/Modules/Orchard.Workflows/Orchard.Workflows.csproj
+++ b/src/Orchard.Web/Modules/Orchard.Workflows/Orchard.Workflows.csproj
@@ -70,7 +70,9 @@
       <RequiredTargetFramework>3.5</RequiredTargetFramework>
     </Reference>
     <Reference Include="System.Data.DataSetExtensions" />
-    <Reference Include="System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
+    <Reference Include="System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+      <Private>true</Private>
+    </Reference>
     <Reference Include="System.Web.ApplicationServices" />
     <Reference Include="System.Web.DynamicData" />
     <Reference Include="System.Web.Entity" />
diff --git a/src/Orchard/Orchard.Framework.csproj b/src/Orchard/Orchard.Framework.csproj
index 9ad2d40c412..4b5493df31e 100644
--- a/src/Orchard/Orchard.Framework.csproj
+++ b/src/Orchard/Orchard.Framework.csproj
@@ -108,7 +108,9 @@
       <RequiredTargetFramework>3.5</RequiredTargetFramework>
     </Reference>
     <Reference Include="System.Data" />
-    <Reference Include="System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
+    <Reference Include="System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+      <Private>true</Private>
+    </Reference>
     <Reference Include="System.Net.Http.Formatting, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <HintPath>..\packages\Microsoft.AspNet.WebApi.Client.5.2.7\lib\net45\System.Net.Http.Formatting.dll</HintPath>
     </Reference>