diff --git a/src/FSharp.Build/Microsoft.FSharp.Targets b/src/FSharp.Build/Microsoft.FSharp.Targets
index 3e5e347d12f..26999e6a646 100644
--- a/src/FSharp.Build/Microsoft.FSharp.Targets
+++ b/src/FSharp.Build/Microsoft.FSharp.Targets
@@ -235,7 +235,7 @@ this file.
         </FSharpEmbedResXSource>
 
         <ItemGroup>
-            <CompileBefore Include="@(_FsGeneratedResXSource)" />
+            <Compile Include="@(_FsGeneratedResXSource)" CompileOrder="CompileBefore" />
             <FsGeneratedSource Include="@(_FsGeneratedResXSource)" />
             <FileWrites Include="@(_FsGeneratedResXSource)" />
         </ItemGroup>
@@ -247,7 +247,7 @@ this file.
         </FSharpEmbedResourceText>
 
         <ItemGroup>
-            <CompileBefore Include="@(_FsGeneratedTxtSource)" />
+            <Compile Include="@(_FsGeneratedTxtSource)" CompileOrder="CompileBefore" />
             <FsGeneratedSource Include="@(_FsGeneratedTxtSource)" />
             <EmbeddedResource Include="@(_FsGeneratedResx)" />
             <FileWrites Include="@(_FsGeneratedTxtSource)" />
@@ -255,6 +255,27 @@ this file.
         </ItemGroup>
     </Target>
 
+    <Target Name="FSharpSourceCodeCompileOrder">
+        <!-- implement <CompileOrder>CompileBefore</CompileOrder> -->
+        <ItemGroup>
+            <__Sources Remove="@(__Sources)" />
+            <__Sources Include="@(Compile->WithMetadataValue('CompileOrder', 'CompileFirst'))" />
+            <__Sources Include="@(CompileBefore)" />
+            <__Sources Include="@(Compile->WithMetadataValue('CompileOrder', 'CompileBefore'))" />
+            <__Sources Include="@(Compile->WithMetadataValue('CompileOrder', ''))" />
+            <__Sources Include="@(Compile->WithMetadataValue('CompileOrder', 'CompileAfter'))" />
+            <__Sources Include="@(CompileAfter)" />
+            <__Sources Include="@(Compile->WithMetadataValue('CompileOrder', 'CompileLast'))" />
+        </ItemGroup>
+        <ItemGroup>
+            <Compile Remove="@(Compile)" />
+            <CompileBefore Remove="@(CompileBefore)" />
+            <CompileAfter Remove="@(CompileAfter)" />
+            <Compile Include="@(__Sources)" />
+        </ItemGroup>
+        <Message Importance="low" Text="FSharpSourceCodeCompileOrder:Sources: '@(__Sources)'" />
+    </Target>
+
     <Target
         Name="CoreCompile"
         Inputs="$(MSBuildAllProjects);
@@ -284,7 +305,7 @@ this file.
                  $(NonExistentFile);
                  @(CustomAdditionalCompileOutputs)"
         Returns="@(FscCommandLineArgs)"
-        DependsOnTargets="$(CoreCompileDependsOn)"
+        DependsOnTargets="$(CoreCompileDependsOn);FSharpSourceCodeCompileOrder"
     >
 
         <Error
@@ -321,6 +342,7 @@ this file.
             <EmbeddedFiles Include="@(FsGeneratedSource)"  KeepDuplicates="false" Condition="'$(SourceLink)'!='' or '$(EmbeddedFiles)'!='' or '$(EmbedAllSources)'!=''" />
         </ItemGroup>
 
+
         <!-- Dotnet SDK requires SimpleResolution to be true Legacy project system build not -->
         <PropertyGroup>
             <FscOtherFlags Condition="'$(SimpleResolution)' == 'true'">--simpleresolution $(OtherFlags)</FscOtherFlags>
@@ -371,7 +393,7 @@ this file.
               Resources="@(ActualEmbeddedResources)"
               SkipCompilerExecution="$(SkipCompilerExecution)"
               SourceLink="$(SourceLink)"
-              Sources="@(CompileBefore);@(Compile);@(CompileAfter)"
+              Sources="@(Compile)"
               SubsystemVersion="$(SubsystemVersion)"
               Tailcalls="$(Tailcalls)"
               TargetType="$(OutputType)"
@@ -434,7 +456,7 @@ this file.
             Overwrite="true"/>
 
         <ItemGroup Condition="'$(AdditionalSourcesText)' != ''">
-            <CompileBefore Include="$(TargetFrameworkMonikerAssemblyAttributesPath)" />
+            <Compile Include="$(TargetFrameworkMonikerAssemblyAttributesPath)"><CompileOrder>CompileBefore</CompileOrder></Compile>
             <_FsGeneratedTfmAttributesSource Include="$(TargetFrameworkMonikerAssemblyAttributesPath)" />
         </ItemGroup>
     </Target>
diff --git a/src/FSharp.Core/FSharp.Core.fsproj b/src/FSharp.Core/FSharp.Core.fsproj
index 0f9fe0fb624..f3e27acaee6 100644
--- a/src/FSharp.Core/FSharp.Core.fsproj
+++ b/src/FSharp.Core/FSharp.Core.fsproj
@@ -61,12 +61,25 @@
     </EmbeddedResource>
     <EmbeddedResource Include="ILLink.LinkAttributes.xml" LogicalName="ILLink.LinkAttributes.xml" />
     <EmbeddedResource Include="ILLink.Substitutions.xml" LogicalName="ILLink.Substitutions.xml" />
+  </ItemGroup>
+  <ItemGroup Condition="'$(Configuration)' == 'Proto'">
+    <!-- This can be removed once CompileBefore support is shipped in an rtm relase -->
     <CompileBefore Include="prim-types-prelude.fsi">
       <Link>Primitives/prim-types-prelude.fsi</Link>
     </CompileBefore>
     <CompileBefore Include="prim-types-prelude.fs">
       <Link>Primitives/prim-types-prelude.fs</Link>
     </CompileBefore>
+  </ItemGroup>
+  <ItemGroup Condition="'$(Configuration)' != 'Proto'">
+    <Compile Include="prim-types-prelude.fsi" CompileOrder="CompileFirst">
+      <Link>Primitives/prim-types-prelude.fsi</Link>
+    </Compile>
+    <Compile Include="prim-types-prelude.fs" CompileOrder="CompileFirst">
+      <Link>Primitives/prim-types-prelude.fs</Link>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
     <Compile Include="prim-types.fsi">
       <Link>Primitives/prim-types.fsi</Link>
     </Compile>
diff --git a/tests/fsharp/SDKTests/tests/CompileOrder - BeforeAndAfter.proj b/tests/fsharp/SDKTests/tests/CompileOrder - BeforeAndAfter.proj
new file mode 100644
index 00000000000..55134523861
--- /dev/null
+++ b/tests/fsharp/SDKTests/tests/CompileOrder - BeforeAndAfter.proj	
@@ -0,0 +1,42 @@
+<Project ToolsVersion="4.0" DefaultTargets="Test" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+
+  <!-- Initialize Variables -->
+  <PropertyGroup>
+    <FSharpCompilerPath></FSharpCompilerPath>
+  </PropertyGroup>
+
+  <!-- Expected Values -->
+  <PropertyGroup>
+    <ExpectedFSharpShimPresent>true</ExpectedFSharpShimPresent>
+    <ExpectedFSharpCompilerPath>/Common7/IDE/CommonExtensions/Microsoft/FSharp/Tools/</ExpectedFSharpCompilerPath>
+    <ExpectedFscToolExe>fscAnyCpu.exe</ExpectedFscToolExe>
+    <ExpectedFscToolPath>_VsInstallRoot_/Common7/IDE/CommonExtensions/Microsoft/FSharp/Tools/</ExpectedFscToolPath>
+    <ExpectedDotnetFscCompilerPath></ExpectedDotnetFscCompilerPath>
+    <ExpectedCompile>One;Two;Three;Four;Five;Six;Seven;Eight;Nine;Ten;Eleven;Twelve;Thirteen;Fourteen</ExpectedCompile>
+  </PropertyGroup>
+
+  <Import Project="ToolsTest.props" />
+
+  <PropertyGroup>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <CompileAfter Include="Eleven" />
+    <Compile Include="Thirteen" CompileOrder="CompileLast" />
+    <CompileBefore Include="Three" />
+    <CompileAfter Include="Twelve" />
+    <CompileBefore Include="Four" />
+    <Compile Include="Seven" />
+    <Compile Include="Eight" />
+    <Compile Include="Five" CompileOrder="CompileBefore" />
+    <Compile Include="One" CompileOrder="CompileFirst" />
+    <Compile Include="Nine" CompileOrder="CompileAfter" />
+    <Compile Include="Fourteen" CompileOrder="CompileLast" />
+    <Compile Include="Ten" CompileOrder="CompileAfter" />
+    <Compile Include="Two" CompileOrder="CompileFirst" />
+    <Compile Include="Six" CompileOrder="CompileBefore" />
+  </ItemGroup>
+
+  <Import Project="ToolsTest.targets" />
+
+</Project>
diff --git a/tests/fsharp/SDKTests/tests/ToolsTest.targets b/tests/fsharp/SDKTests/tests/ToolsTest.targets
index 7a4138e5eed..3e68a5af856 100644
--- a/tests/fsharp/SDKTests/tests/ToolsTest.targets
+++ b/tests/fsharp/SDKTests/tests/ToolsTest.targets
@@ -4,10 +4,11 @@
 
   <Import Project="$(TargetsDirectory)\Microsoft.FSharp.targets" />
 
-  <Target Name="Test">
+  <Target Name="Test" DependsOnTargets="FSharpSourceCodeCompileOrder">
     <Message Importance="High" Text="===========================================================================================================" />
     <Message Importance="High" Text="Testing : $(MSBuildProjectName)" />
 
+
     <!-- check for expected settings -->
     <Error Condition="'$(ExpectedFSharpShimPresent)' != '$(FSharp_Shim_Present)'" Text="FSharp_Shim_Present expected:'$(ExpectedFSharpShimPresent)' actual: '$(FSharp_Shim_Present)'" />
 
@@ -17,6 +18,8 @@
 
     <Error Condition="'$(ExpectedFscToolPath)' != '$(FscToolPath)'" Text="FscToolPath:  expected:'$(ExpectedFscToolPath)' actual:'$(FscToolPath)'" />
 
+    <Error Condition="'$(ExpectedCompile)' != '' and  '$(ExpectedCompile)' != '@(Compile)'" Text="ExpectedCompile:  expected:'$(ExpectedCompile)' actual:'@(Compile)'" />
+
     <Error Condition="'$(ExpectedDotnetFscCompilerPath)' == '' and '$(DotnetFscCompilerPath)' != ''" Text="DotnetFscCompilerPath expected to be empty actual:'$(DotnetFscCompilerPath)'" />
 
     <Error Condition="'$(ExpectedDotnetFscCompilerPath)' != '' and $([System.String]::new('$(DotnetFscCompilerPath)').EndsWith('$(ExpectedDotnetFscCompilerPath)')) == true" Text="DotnetFscCompilerPath expected to end with:  '$(ExpectedDotnetFscCompilerPath)' actual:'$(DotnetFscCompilerPath)'" />