diff --git a/src/Numerics/NonConvergenceException.cs b/src/Numerics/NonConvergenceException.cs
index cf800d8f..9e873726 100644
--- a/src/Numerics/NonConvergenceException.cs
+++ b/src/Numerics/NonConvergenceException.cs
@@ -1,5 +1,4 @@
 using System;
-using System.Runtime.Serialization;
 using MathNet.Numerics.Properties;
 
 namespace MathNet.Numerics
@@ -20,9 +19,11 @@ namespace MathNet.Numerics
         public NonConvergenceException(string message, Exception innerException) : base(message, innerException)
         {
         }
-
-        protected NonConvergenceException(SerializationInfo info, StreamingContext context) : base(info, context)
+#if !PORTABLE
+        protected NonConvergenceException(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context)
+            : base(info, context)
         {
         }
+#endif
     }
 }
diff --git a/src/Portable/Portable.csproj b/src/Portable/Portable.csproj
index c471e09e..b190ce8c 100644
--- a/src/Portable/Portable.csproj
+++ b/src/Portable/Portable.csproj
@@ -927,6 +927,9 @@
     <Compile Include="..\Numerics\LinearAlgebra\Storage\VectorStorage.Validation.cs">
       <Link>LinearAlgebra\Storage\VectorStorage.Validation.cs</Link>
     </Compile>
+    <Compile Include="..\Numerics\NonConvergenceException.cs">
+      <Link>NonConvergenceException.cs</Link>
+    </Compile>
     <Compile Include="..\Numerics\NumberTheory\IntegerTheory.cs">
       <Link>NumberTheory\IntegerTheory.cs</Link>
     </Compile>
@@ -981,6 +984,12 @@
     <Compile Include="..\Numerics\Random\Xorshift.cs">
       <Link>Random\Xorshift.cs</Link>
     </Compile>
+    <Compile Include="..\Numerics\RootFinding\Bracketing.cs">
+      <Link>RootFinding\Bracketing.cs</Link>
+    </Compile>
+    <Compile Include="..\Numerics\RootFinding\FindRoots.cs">
+      <Link>RootFinding\FindRoots.cs</Link>
+    </Compile>
     <Compile Include="..\Numerics\SerializableAttribute.cs">
       <Link>SerializableAttribute.cs</Link>
     </Compile>