diff --git a/examples/csharp/HelloworldXamarin/Droid/HelloworldXamarin.Droid.csproj b/examples/csharp/HelloworldXamarin/Droid/HelloworldXamarin.Droid.csproj
index 157fa3f0ef4..b5ca8490a48 100644
--- a/examples/csharp/HelloworldXamarin/Droid/HelloworldXamarin.Droid.csproj
+++ b/examples/csharp/HelloworldXamarin/Droid/HelloworldXamarin.Droid.csproj
@@ -53,6 +53,9 @@
     <Reference Include="Grpc.Core">
       <HintPath>..\packages\Grpc.Core.1.15.0-dev\lib\netstandard1.5\Grpc.Core.dll</HintPath>
     </Reference>
+    <Reference Include="Google.Protobuf">
+      <HintPath>..\packages\Google.Protobuf.3.6.0\lib\netstandard1.0\Google.Protobuf.dll</HintPath>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="MainActivity.cs" />
diff --git a/examples/csharp/HelloworldXamarin/Droid/packages.config b/examples/csharp/HelloworldXamarin/Droid/packages.config
index 4fee491e7e9..3574b6782b3 100644
--- a/examples/csharp/HelloworldXamarin/Droid/packages.config
+++ b/examples/csharp/HelloworldXamarin/Droid/packages.config
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
+  <package id="Google.Protobuf" version="3.6.0" targetFramework="monoandroid81" />
   <package id="Grpc.Core" version="1.15.0-dev" targetFramework="monoandroid81" />
   <package id="Microsoft.NETCore.Platforms" version="1.1.0" targetFramework="monoandroid81" />
   <package id="Microsoft.Win32.Primitives" version="4.3.0" targetFramework="monoandroid81" />
diff --git a/examples/csharp/HelloworldXamarin/iOS/HelloworldXamarin.iOS.csproj b/examples/csharp/HelloworldXamarin/iOS/HelloworldXamarin.iOS.csproj
index f968398278f..b5c0d1d1192 100644
--- a/examples/csharp/HelloworldXamarin/iOS/HelloworldXamarin.iOS.csproj
+++ b/examples/csharp/HelloworldXamarin/iOS/HelloworldXamarin.iOS.csproj
@@ -92,6 +92,9 @@
     <Reference Include="Grpc.Core">
       <HintPath>..\packages\Grpc.Core.1.15.0-dev\lib\netstandard1.5\Grpc.Core.dll</HintPath>
     </Reference>
+    <Reference Include="Google.Protobuf">
+      <HintPath>..\packages\Google.Protobuf.3.6.0\lib\netstandard1.0\Google.Protobuf.dll</HintPath>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Contents.json" />
diff --git a/examples/csharp/HelloworldXamarin/iOS/packages.config b/examples/csharp/HelloworldXamarin/iOS/packages.config
index ad960e401e5..ce4bceb62a8 100644
--- a/examples/csharp/HelloworldXamarin/iOS/packages.config
+++ b/examples/csharp/HelloworldXamarin/iOS/packages.config
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
+  <package id="Google.Protobuf" version="3.6.0" targetFramework="xamarinios10" />
   <package id="Grpc.Core" version="1.15.0-dev" targetFramework="xamarinios10" />
   <package id="Microsoft.NETCore.Platforms" version="1.1.0" targetFramework="xamarinios10" />
   <package id="Microsoft.Win32.Primitives" version="4.3.0" targetFramework="xamarinios10" />