diff --git a/src/FSharp/FSharp-Portable136.fsproj b/src/FSharp/FSharp-Portable136.fsproj
index 24a73bcd..dbfde3a0 100644
--- a/src/FSharp/FSharp-Portable136.fsproj
+++ b/src/FSharp/FSharp-Portable136.fsproj
@@ -50,7 +50,6 @@
     <Compile Include="Distributions.fs" />
     <Compile Include="LinearAlgebra.Vector.fs" />
     <Compile Include="LinearAlgebra.Matrix.fs" />
-    <Compile Include="Complex.fsi" />
     <Compile Include="Complex.fs" />
     <Compile Include="BigIntegerExtensions.fs" />
     <Compile Include="BigRational.fsi" />
diff --git a/src/FSharp/FSharp-Portable47.fsproj b/src/FSharp/FSharp-Portable47.fsproj
index 72f31551..f169b4e9 100644
--- a/src/FSharp/FSharp-Portable47.fsproj
+++ b/src/FSharp/FSharp-Portable47.fsproj
@@ -50,7 +50,6 @@
     <Compile Include="Distributions.fs" />
     <Compile Include="LinearAlgebra.Vector.fs" />
     <Compile Include="LinearAlgebra.Matrix.fs" />
-    <Compile Include="Complex.fsi" />
     <Compile Include="Complex.fs" />
     <Compile Include="BigIntegerExtensions.fs" />
     <Compile Include="BigRational.fsi" />