diff --git a/src/Npgsql.EntityFrameworkCore.PostgreSQL.Design/Npgsql.EntityFrameworkCore.PostgreSQL.Design.csproj b/src/Npgsql.EntityFrameworkCore.PostgreSQL.Design/Npgsql.EntityFrameworkCore.PostgreSQL.Design.csproj
index af9898e6177dd01fb80c1db7597c820fdef7a53a..69f5dec17a5ce7f1c69b8789dd6df0bb9ba26bff 100644
--- a/src/Npgsql.EntityFrameworkCore.PostgreSQL.Design/Npgsql.EntityFrameworkCore.PostgreSQL.Design.csproj
+++ b/src/Npgsql.EntityFrameworkCore.PostgreSQL.Design/Npgsql.EntityFrameworkCore.PostgreSQL.Design.csproj
@@ -13,6 +13,9 @@
     <AssemblyName>Npgsql.EntityFrameworkCore.PostgreSQL.Design</AssemblyName>
     <TargetFrameworkVersion>v4.5.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
+    <!-- The following stops VS from complaining about runtimes in project.json, see
+                 https://github.com/Microsoft/msbuild/issues/394 -->
+    <CopyNuGetImplementations>false</CopyNuGetImplementations>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -85,4 +88,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
\ No newline at end of file
+</Project>
diff --git a/src/Npgsql.EntityFrameworkCore.PostgreSQL.Design/project.json b/src/Npgsql.EntityFrameworkCore.PostgreSQL.Design/project.json
index c498b5496706f0ef78e2bc91abb223257413d0a0..d99feef573e2bb0b5d2eec17b34cd140dd92967a 100644
--- a/src/Npgsql.EntityFrameworkCore.PostgreSQL.Design/project.json
+++ b/src/Npgsql.EntityFrameworkCore.PostgreSQL.Design/project.json
@@ -14,9 +14,6 @@
     "keyFile": "../../Npgsql.snk",
     "warningsAsErrors": true
   },
-  "runtimes": {
-    "win": {}
-  },
   "dependencies" : {
     "Microsoft.EntityFrameworkCore": "1.0.0-rc2-*",
     "Microsoft.EntityFrameworkCore.Relational": "1.0.0-rc2-*",
diff --git a/src/Npgsql.EntityFrameworkCore.PostgreSQL/Npgsql.EntityFrameworkCore.PostgreSQL.csproj b/src/Npgsql.EntityFrameworkCore.PostgreSQL/Npgsql.EntityFrameworkCore.PostgreSQL.csproj
index ebce8ef9cde9c102eae0c4bb1e680fafa005e8e8..cdb6ada3c48754c13c8ff25123b20c869e32eeaa 100644
--- a/src/Npgsql.EntityFrameworkCore.PostgreSQL/Npgsql.EntityFrameworkCore.PostgreSQL.csproj
+++ b/src/Npgsql.EntityFrameworkCore.PostgreSQL/Npgsql.EntityFrameworkCore.PostgreSQL.csproj
@@ -13,6 +13,9 @@
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>..\..\Npgsql.snk</AssemblyOriginatorKeyFile>
     <TargetFrameworkProfile />
+    <!-- The following stops VS from complaining about runtimes in project.json, see
+             https://github.com/Microsoft/msbuild/issues/394 -->
+    <CopyNuGetImplementations>false</CopyNuGetImplementations>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -123,4 +126,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
\ No newline at end of file
+</Project>
diff --git a/src/Npgsql.EntityFrameworkCore.PostgreSQL/project.json b/src/Npgsql.EntityFrameworkCore.PostgreSQL/project.json
index 463fb5ddd0037c08705521cf4bc28ced4d705193..4aeecee16cb674aeeca3206fcfff88f819ef42f0 100644
--- a/src/Npgsql.EntityFrameworkCore.PostgreSQL/project.json
+++ b/src/Npgsql.EntityFrameworkCore.PostgreSQL/project.json
@@ -14,9 +14,6 @@
     "keyFile": "../../Npgsql.snk",
     "warningsAsErrors": true
   },
-  "runtimes": {
-    "win": {}
-  },
   "dependencies" : {
     "Microsoft.EntityFrameworkCore": "1.0.0-rc2-*",
     "Microsoft.EntityFrameworkCore.Relational": "1.0.0-rc2-*",
diff --git a/test/Npgsql.EntityFrameworkCore.PostgreSQL.Design.FunctionalTests/Npgsql.EntityFrameworkCore.PostgreSQL.Design.FunctionalTests.csproj b/test/Npgsql.EntityFrameworkCore.PostgreSQL.Design.FunctionalTests/Npgsql.EntityFrameworkCore.PostgreSQL.Design.FunctionalTests.csproj
index b3aee5e1fed3382444e04045a3afdde0e800876f..e34ba71712d607016d7b32241e7ef2a35158afbb 100644
--- a/test/Npgsql.EntityFrameworkCore.PostgreSQL.Design.FunctionalTests/Npgsql.EntityFrameworkCore.PostgreSQL.Design.FunctionalTests.csproj
+++ b/test/Npgsql.EntityFrameworkCore.PostgreSQL.Design.FunctionalTests/Npgsql.EntityFrameworkCore.PostgreSQL.Design.FunctionalTests.csproj
@@ -11,6 +11,9 @@
     <AssemblyName>Npgsql.EntityFrameworkCore.PostgreSQL.Design.FunctionalTests</AssemblyName>
     <TargetFrameworkVersion>v4.5.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
+    <!-- The following stops VS from complaining about runtimes in project.json, see
+                 https://github.com/Microsoft/msbuild/issues/394 -->
+    <CopyNuGetImplementations>false</CopyNuGetImplementations>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -177,4 +180,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
\ No newline at end of file
+</Project>
diff --git a/test/Npgsql.EntityFrameworkCore.PostgreSQL.Design.FunctionalTests/project.json b/test/Npgsql.EntityFrameworkCore.PostgreSQL.Design.FunctionalTests/project.json
index 27b0ca561e0f2024a81c9bd0386dc20ddf3831d8..c9ac5f7359abcdcd2787fe48760e4e034af7d1d1 100644
--- a/test/Npgsql.EntityFrameworkCore.PostgreSQL.Design.FunctionalTests/project.json
+++ b/test/Npgsql.EntityFrameworkCore.PostgreSQL.Design.FunctionalTests/project.json
@@ -1,8 +1,5 @@
 {
   "version": "0.0.0",
-  "runtimes": {
-    "win": {}
-  },
   "content": [
     "ReverseEngineering/**/*.expected",
     "ReverseEngineering/**/*.sql"
diff --git a/test/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests.csproj b/test/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests.csproj
index 197dff8100992d1944b58f38451ed71de9367bee..b0bce35c846625a0a12e1fcffbbaf09e58d320ed 100644
--- a/test/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests.csproj
+++ b/test/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests.csproj
@@ -12,6 +12,9 @@
     <TargetFrameworkVersion>v4.5.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
+    <!-- The following stops VS from complaining about runtimes in project.json, see
+                 https://github.com/Microsoft/msbuild/issues/394 -->
+    <CopyNuGetImplementations>false</CopyNuGetImplementations>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -117,4 +120,4 @@
     <Content Include="Northwind.sql" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-</Project>
\ No newline at end of file
+</Project>
diff --git a/test/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests/project.json b/test/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests/project.json
index c181f673bc2d107409475023e98b67222b1c1266..14fade93a3b83d6a736d696c6be1b14efd0467d0 100644
--- a/test/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests/project.json
+++ b/test/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests/project.json
@@ -1,9 +1,6 @@
 {
   "version": "0.0.0",
   "content": "**/*.sql",
-  "runtimes": {
-    "win": {}
-  },
   "dependencies": {
     "Microsoft.EntityFrameworkCore": "1.0.0-rc2-*",
     "Microsoft.EntityFrameworkCore.Relational": "1.0.0-rc2-*",
diff --git a/test/Npgsql.EntityFrameworkCore.PostgreSQL.Tests/Npgsql.EntityFrameworkCore.PostgreSQL.Tests.csproj b/test/Npgsql.EntityFrameworkCore.PostgreSQL.Tests/Npgsql.EntityFrameworkCore.PostgreSQL.Tests.csproj
index d64d8b80aeacd0150b98ace64cea03fe0f8ab52b..e2f35cea269cfdb2b275258d6f8b85702a6a513e 100644
--- a/test/Npgsql.EntityFrameworkCore.PostgreSQL.Tests/Npgsql.EntityFrameworkCore.PostgreSQL.Tests.csproj
+++ b/test/Npgsql.EntityFrameworkCore.PostgreSQL.Tests/Npgsql.EntityFrameworkCore.PostgreSQL.Tests.csproj
@@ -11,6 +11,9 @@
     <AssemblyName>Npgsql.EntityFrameworkCore.PostgreSQL.Tests</AssemblyName>
     <TargetFrameworkVersion>v4.5.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
+    <!-- The following stops VS from complaining about runtimes in project.json, see
+                 https://github.com/Microsoft/msbuild/issues/394 -->
+    <CopyNuGetImplementations>false</CopyNuGetImplementations>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -66,4 +69,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
\ No newline at end of file
+</Project>
diff --git a/test/Npgsql.EntityFrameworkCore.PostgreSQL.Tests/project.json b/test/Npgsql.EntityFrameworkCore.PostgreSQL.Tests/project.json
index 5b6d3b61a23a78596b4c99e74eb2fa342009e127..31675e0c0ddbcfdf97ac91e7df9cd20ad1bd6f49 100644
--- a/test/Npgsql.EntityFrameworkCore.PostgreSQL.Tests/project.json
+++ b/test/Npgsql.EntityFrameworkCore.PostgreSQL.Tests/project.json
@@ -1,8 +1,5 @@
 {
   "version": "0.0.0",
-  "runtimes": {
-    "win": {}
-  },
   "dependencies": {
     "Microsoft.Extensions.Logging": "1.0.0-*",
     "Microsoft.EntityFrameworkCore": "1.0.0-rc2-*",