diff --git a/fcs/FSharp.Compiler.Service/FSharp.Compiler.Service.fsproj b/fcs/FSharp.Compiler.Service/FSharp.Compiler.Service.fsproj
index e5c32ea5a84872eed2f603ec3ae280b30bbd9623..8f1c6116e0c1ceaab90ef12f609bab7edde231c8 100644
--- a/fcs/FSharp.Compiler.Service/FSharp.Compiler.Service.fsproj
+++ b/fcs/FSharp.Compiler.Service/FSharp.Compiler.Service.fsproj
@@ -603,6 +603,10 @@
     <Reference Include="System.Collections.Immutable">
       <HintPath>$(FSharpSourcesRoot)\..\..\packages\System.Collections.Immutable.1.2.0\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
     </Reference>
+    <Reference Include="System.ValueTuple">
+      <HintPath>$(FSharpSourcesRoot)\..\..\packages\System.ValueTuple.4.3.0\lib\netstandard1.0\System.ValueTuple.dll</HintPath>
+      <Private>true</Private>
+    </Reference>
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/fsharp/CompileOps.fs b/src/fsharp/CompileOps.fs
index a9276cdf0fe8af41fed2e9d532a7925263c5ba41..2a5e984e4e538fdcd14898e6c1757d3dcd9ac52a 100644
--- a/src/fsharp/CompileOps.fs
+++ b/src/fsharp/CompileOps.fs
@@ -3555,7 +3555,7 @@ type TcAssemblyResolutions(results : AssemblyResolution list, unresolved : Unres
             let assumeDotNetFramework = primaryReference.SimpleAssemblyNameIs("mscorlib")
             if tcConfig.framework then 
                 for s in DefaultReferencesForScriptsAndOutOfProjectSources(assumeDotNetFramework) do 
-                    yield AssemblyReference(rangeStartup,s+".dll",None)
+                    yield AssemblyReference(rangeStartup,(if s.EndsWith(".dll") then s else s+".dll"),None)
 
             if tcConfig.useFsiAuxLib then
                 let name = Path.Combine(tcConfig.fsharpBinariesDir, GetFsiLibraryName() + ".dll")
diff --git a/tests/scripts/compiler-perf-results.txt b/tests/scripts/compiler-perf-results.txt
index fba16527fd0933a6c05146fc555ed88f68803e42..984c1df04dd73cc17870b2fdf72e9f0439ac18f3 100644
--- a/tests/scripts/compiler-perf-results.txt
+++ b/tests/scripts/compiler-perf-results.txt
@@ -116,3 +116,5 @@ https://github.com/manofstick/visualfsharp.git manofstick-iseq-part2        8c1c
 https://github.com/jack-pappas/visualfsharp.git issue-1094                   10c60c53d869e03be86b7815837cf6fd73c3095b ba63403cb5898596c5e875a14ce22b33ef618c01 195.12 11.73                30.09                46.20                63.30                52.68               
 https://github.com/dsyme/visualfsharp.git mem-tp-fix-1                 0eb3de2961d80cce04e216614eb560ce12b6d459 ba63403cb5898596c5e875a14ce22b33ef618c01 200.28 10.38                30.20                46.68                61.81                51.27               
 https://github.com/Microsoft/visualfsharp master                       ba63403cb5898596c5e875a14ce22b33ef618c01 ba63403cb5898596c5e875a14ce22b33ef618c01 204.45 9.93                29.26                45.39                61.16                52.88               
+https://github.com/manofstick/visualfsharp.git all-your-collections-are-belong-to-us 87dafbc17b494c438b6db9e59e064736bd8a44e2 ba63403cb5898596c5e875a14ce22b33ef618c01 221.58 11.19                31.91                48.23                66.05                52.99               
+https://github.com/dsyme/visualfsharp.git acv1                         e37c1a96f3a3069ef37fb4325eeb09385e419cb6 ba63403cb5898596c5e875a14ce22b33ef618c01 200.59 10.45                30.36                46.08                63.29                52.91