diff --git a/PushSharp.FirefoxOS/PushSharp.FirefoxOS.csproj b/PushSharp.FirefoxOS/PushSharp.FirefoxOS.csproj
index f574d64a..c0db10db 100644
--- a/PushSharp.FirefoxOS/PushSharp.FirefoxOS.csproj
+++ b/PushSharp.FirefoxOS/PushSharp.FirefoxOS.csproj
@@ -9,8 +9,9 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>PushSharp.FirefoxOS</RootNamespace>
     <AssemblyName>PushSharp.FirefoxOS</AssemblyName>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>