diff --git a/StoredProcedureEFCore.sln b/StoredProcedureEFCore.sln
index 7fe4c1b..3658ff3 100644
--- a/StoredProcedureEFCore.sln
+++ b/StoredProcedureEFCore.sln
@@ -3,25 +3,22 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
 VisualStudioVersion = 15.0.27004.2008
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "StoredProcedureEFCore", "StoredProcedureEFCore\StoredProcedureEFCore.csproj", "{4AD24010-ADC2-463A-B0F7-7BFD8B89CDB7}"
-EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "StoredProcedureEFCore.Tests.SqlServer", "StoredProcedureEFCore.Tests.SqlServer\StoredProcedureEFCore.Tests.SqlServer.csproj", "{B0106B50-2BA8-4DF1-87C9-18EF750495EF}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "StoredProcedureEFCore.Tests", "StoredProcedureEFCore.Tests\StoredProcedureEFCore.Tests.csproj", "{5D2098BD-42DB-48D5-8AF9-90796F436538}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StoredProcedureEFCore.Tests.PgSql", "StoredProcedureEFCore.Tests.PgSql\StoredProcedureEFCore.Tests.PgSql.csproj", "{8CD344F4-31A9-4A7F-AF62-0DC9A08C98F9}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "StoredProcedureEFCore.Tests.PgSql", "StoredProcedureEFCore.Tests.PgSql\StoredProcedureEFCore.Tests.PgSql.csproj", "{8CD344F4-31A9-4A7F-AF62-0DC9A08C98F9}"
+EndProject
 Project("{00D1A9C2-B5F0-4AF3-8072-F6C62B433612}") = "StoredProcedureEFCore.Tests.SqlServer.Database", "StoredProcedureEFCore.Tests.SqlServer.Database\StoredProcedureEFCore.Tests.SqlServer.Database.sqlproj", "{3C66C52D-A576-4E88-8883-A98A241C3EB5}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StoredProcedureEFCore", "StoredProcedureEFCore\StoredProcedureEFCore.csproj", "{654361F1-5E5A-4C9E-8A12-CF2F682D5CB7}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
 		Release|Any CPU = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{4AD24010-ADC2-463A-B0F7-7BFD8B89CDB7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{4AD24010-ADC2-463A-B0F7-7BFD8B89CDB7}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{4AD24010-ADC2-463A-B0F7-7BFD8B89CDB7}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{4AD24010-ADC2-463A-B0F7-7BFD8B89CDB7}.Release|Any CPU.Build.0 = Release|Any CPU
 		{B0106B50-2BA8-4DF1-87C9-18EF750495EF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{B0106B50-2BA8-4DF1-87C9-18EF750495EF}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{B0106B50-2BA8-4DF1-87C9-18EF750495EF}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -30,20 +27,20 @@ Global
 		{5D2098BD-42DB-48D5-8AF9-90796F436538}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{5D2098BD-42DB-48D5-8AF9-90796F436538}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{5D2098BD-42DB-48D5-8AF9-90796F436538}.Release|Any CPU.Build.0 = Release|Any CPU
+		{8CD344F4-31A9-4A7F-AF62-0DC9A08C98F9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8CD344F4-31A9-4A7F-AF62-0DC9A08C98F9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8CD344F4-31A9-4A7F-AF62-0DC9A08C98F9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8CD344F4-31A9-4A7F-AF62-0DC9A08C98F9}.Release|Any CPU.Build.0 = Release|Any CPU
 		{3C66C52D-A576-4E88-8883-A98A241C3EB5}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{3C66C52D-A576-4E88-8883-A98A241C3EB5}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{3C66C52D-A576-4E88-8883-A98A241C3EB5}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
 		{3C66C52D-A576-4E88-8883-A98A241C3EB5}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{3C66C52D-A576-4E88-8883-A98A241C3EB5}.Release|Any CPU.Build.0 = Release|Any CPU
 		{3C66C52D-A576-4E88-8883-A98A241C3EB5}.Release|Any CPU.Deploy.0 = Release|Any CPU
-		{5D2098BD-42DB-48D5-8AF9-90796F436538}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{5D2098BD-42DB-48D5-8AF9-90796F436538}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{5D2098BD-42DB-48D5-8AF9-90796F436538}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{5D2098BD-42DB-48D5-8AF9-90796F436538}.Release|Any CPU.Build.0 = Release|Any CPU
-		{8CD344F4-31A9-4A7F-AF62-0DC9A08C98F9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{8CD344F4-31A9-4A7F-AF62-0DC9A08C98F9}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{8CD344F4-31A9-4A7F-AF62-0DC9A08C98F9}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{8CD344F4-31A9-4A7F-AF62-0DC9A08C98F9}.Release|Any CPU.Build.0 = Release|Any CPU
+		{654361F1-5E5A-4C9E-8A12-CF2F682D5CB7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{654361F1-5E5A-4C9E-8A12-CF2F682D5CB7}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{654361F1-5E5A-4C9E-8A12-CF2F682D5CB7}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{654361F1-5E5A-4C9E-8A12-CF2F682D5CB7}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/StoredProcedureEFCore/DbTypeConverter.cs b/StoredProcedureEFCore/DbTypeConverter.cs
index c5c2ae2..994d00c 100644
--- a/StoredProcedureEFCore/DbTypeConverter.cs
+++ b/StoredProcedureEFCore/DbTypeConverter.cs
@@ -4,7 +4,7 @@
 
 namespace StoredProcedureEFCore
 {
-  public static class DbTypeConverter
+  internal static class DbTypeConverter
   {
     private static Dictionary<Type, DbType> _typeMap = new Dictionary<Type, DbType>
     {
diff --git a/StoredProcedureEFCore/StoredProcBuilder.cs b/StoredProcedureEFCore/StoredProcBuilder.cs
index aa1a6de..c44273f 100644
--- a/StoredProcedureEFCore/StoredProcBuilder.cs
+++ b/StoredProcedureEFCore/StoredProcBuilder.cs
@@ -24,25 +24,25 @@ public StoredProcBuilder(DbContext ctx, string name)
 
     public IStoredProcBuilder AddParam<T>(string name, T val)
     {
-      AddParamInner<T>(name, val, ParameterDirection.Input);
+      AddParamInner(name, val, ParameterDirection.Input);
       return this;
     }
 
     public IStoredProcBuilder AddParam<T>(string name, out IOutParam<T> outParam)
     {
-      outParam = AddOutputParamInner<T>(name, default(T), ParameterDirection.Output);
+      outParam = AddOutputParamInner(name, default(T), ParameterDirection.Output);
       return this;
     }
 
     public IStoredProcBuilder AddParam<T>(string name, T val, out IOutParam<T> outParam)
     {
-      outParam = AddOutputParamInner<T>(name, val, ParameterDirection.InputOutput);
+      outParam = AddOutputParamInner(name, val, ParameterDirection.InputOutput);
       return this;
     }
 
     public IStoredProcBuilder ReturnValue<T>(out IOutParam<T> retParam)
     {
-      retParam = AddOutputParamInner<T>("_retParam", default(T), ParameterDirection.ReturnValue);
+      retParam = AddOutputParamInner("_retParam", default(T), ParameterDirection.ReturnValue);
       return this;
     }
 
@@ -169,9 +169,9 @@ private void OpenConnection()
       _cmd.Connection.Open();
     }
 
-    private async Task OpenConnectionAsync()
+    private Task OpenConnectionAsync()
     {
-      await _cmd.Connection.OpenAsync();
+      return _cmd.Connection.OpenAsync();
     }
   }
 }
diff --git a/StoredProcedureEFCore/StoredProcedureEFCore.csproj b/StoredProcedureEFCore/StoredProcedureEFCore.csproj
index ec6bee5..f731f5e 100644
--- a/StoredProcedureEFCore/StoredProcedureEFCore.csproj
+++ b/StoredProcedureEFCore/StoredProcedureEFCore.csproj
@@ -1,9 +1,8 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
-
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>netcoreapp1.1</TargetFramework>
+    <TargetFramework>netstandard1.3</TargetFramework>
     <Title>StoredProcedureEFCore</Title>
-    <Version>0.3.1</Version>
+    <Version>0.3.2</Version>
     <Authors>Grégoire Verdier</Authors>
     <Description>Entity Framework Core extension to execute a stored procedure and map the result</Description>
     <RepositoryUrl>https://github.com/verdie-g/StoredProcedureEFCore</RepositoryUrl>
@@ -17,10 +16,7 @@
     <IsPackable>true</IsPackable>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore" Version="1.1.1" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="1.1.1" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="1.1.1" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="1.0.1" />
     <PackageReference Include="System.Data.Common" Version="4.3.0" />
   </ItemGroup>
-
 </Project>