diff --git a/src/Microsoft.AspNetCore.Mvc.ApiExplorer/DefaultApiDescriptionProvider.cs b/src/Microsoft.AspNetCore.Mvc.ApiExplorer/DefaultApiDescriptionProvider.cs
index 5deb746f94..dcab0a3d8c 100644
--- a/src/Microsoft.AspNetCore.Mvc.ApiExplorer/DefaultApiDescriptionProvider.cs
+++ b/src/Microsoft.AspNetCore.Mvc.ApiExplorer/DefaultApiDescriptionProvider.cs
@@ -4,7 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-#if DOTNET5_4
+#if NETSTANDARD1_3
 using System.Reflection;
 #endif
 using System.Threading.Tasks;
diff --git a/src/Microsoft.AspNetCore.Mvc.Core/BindAttribute.cs b/src/Microsoft.AspNetCore.Mvc.Core/BindAttribute.cs
index 0c2cfc4059..43921f94ee 100644
--- a/src/Microsoft.AspNetCore.Mvc.Core/BindAttribute.cs
+++ b/src/Microsoft.AspNetCore.Mvc.Core/BindAttribute.cs
@@ -4,7 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-#if DOTNET5_4
+#if NETSTANDARD1_3
 using System.Reflection;
 #endif
 using Microsoft.AspNetCore.Mvc.Core;
diff --git a/src/Microsoft.AspNetCore.Mvc.Core/Filters/FilterCollection.cs b/src/Microsoft.AspNetCore.Mvc.Core/Filters/FilterCollection.cs
index 3f7d5fb97c..08243af1be 100644
--- a/src/Microsoft.AspNetCore.Mvc.Core/Filters/FilterCollection.cs
+++ b/src/Microsoft.AspNetCore.Mvc.Core/Filters/FilterCollection.cs
@@ -3,7 +3,7 @@
 
 using System;
 using System.Collections.ObjectModel;
-#if DOTNET5_4
+#if NETSTANDARD1_3
 using System.Reflection;
 #endif
 using Microsoft.AspNetCore.Mvc.Core;
diff --git a/src/Microsoft.AspNetCore.Mvc.Core/Internal/ControllerActionInvoker.cs b/src/Microsoft.AspNetCore.Mvc.Core/Internal/ControllerActionInvoker.cs
index 2cf6f425f0..38c2da8966 100644
--- a/src/Microsoft.AspNetCore.Mvc.Core/Internal/ControllerActionInvoker.cs
+++ b/src/Microsoft.AspNetCore.Mvc.Core/Internal/ControllerActionInvoker.cs
@@ -4,7 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
-#if DOTNET5_4
+#if NETSTANDARD1_3
 using System.Reflection;
 #endif
 using System.Threading.Tasks;
diff --git a/src/Microsoft.AspNetCore.Mvc.Dnx/DnxRoslynCompilationService.cs b/src/Microsoft.AspNetCore.Mvc.Dnx/DnxRoslynCompilationService.cs
index c756a41f86..2f72a90809 100644
--- a/src/Microsoft.AspNetCore.Mvc.Dnx/DnxRoslynCompilationService.cs
+++ b/src/Microsoft.AspNetCore.Mvc.Dnx/DnxRoslynCompilationService.cs
@@ -9,7 +9,7 @@ using System.IO;
 using System.Linq;
 using System.Reflection;
 using System.Reflection.PortableExecutable;
-#if DOTNET5_6
+#if NETSTANDARD1_5
 using System.Runtime.Loader;
 #endif
 using System.Text;
@@ -36,7 +36,7 @@ namespace Microsoft.AspNetCore.Mvc.Razor.Internal
         private readonly ILibraryExporter _libraryExporter;
         private readonly RazorViewEngineOptions _options;
         private readonly Lazy<List<MetadataReference>> _applicationReferences;
-#if DOTNET5_6
+#if NETSTANDARD1_5
         private readonly RazorLoadContext _razorLoadContext;
 #endif
 
@@ -58,7 +58,7 @@ namespace Microsoft.AspNetCore.Mvc.Razor.Internal
             _options = optionsAccessor.Value;
             _applicationReferences = new Lazy<List<MetadataReference>>(GetApplicationReferences);
 
-#if DOTNET5_6
+#if NETSTANDARD1_5
             _razorLoadContext = new RazorLoadContext();
 #endif
         }
@@ -149,7 +149,7 @@ namespace Microsoft.AspNetCore.Mvc.Razor.Internal
 
         private Assembly LoadStream(MemoryStream ms, MemoryStream assemblySymbols)
         {
-#if DOTNET5_6
+#if NETSTANDARD1_5
             return _razorLoadContext.Load(ms, assemblySymbols);
 #else
             return Assembly.Load(ms.ToArray(), assemblySymbols?.ToArray());
@@ -244,7 +244,7 @@ namespace Microsoft.AspNetCore.Mvc.Razor.Internal
 
             return metadata.GetReference(filePath: path);
         }
-#if DOTNET5_6
+#if NETSTANDARD1_5
         private class RazorLoadContext : AssemblyLoadContext
         {
             protected override Assembly Load(AssemblyName assemblyName)
diff --git a/src/Microsoft.AspNetCore.Mvc.Dnx/project.json b/src/Microsoft.AspNetCore.Mvc.Dnx/project.json
index 84cec3a2f3..a68452f014 100644
--- a/src/Microsoft.AspNetCore.Mvc.Dnx/project.json
+++ b/src/Microsoft.AspNetCore.Mvc.Dnx/project.json
@@ -20,8 +20,11 @@
   },
   "frameworks": {
     "net451": {},
-    "dotnet5.6": {
-      "imports": "portable-net451+win8"
+    "netstandard1.5": {
+      "imports": [
+        "portable-net451+win8",
+        "dotnet5.6"
+      ]
     }
   }
 }
\ No newline at end of file
diff --git a/src/Microsoft.AspNetCore.Mvc.TagHelpers/SelectTagHelper.cs b/src/Microsoft.AspNetCore.Mvc.TagHelpers/SelectTagHelper.cs
index fc861d22fa..e53c1ed1c3 100644
--- a/src/Microsoft.AspNetCore.Mvc.TagHelpers/SelectTagHelper.cs
+++ b/src/Microsoft.AspNetCore.Mvc.TagHelpers/SelectTagHelper.cs
@@ -5,7 +5,7 @@ using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
-#if DOTNET5_6
+#if NETSTANDARD1_5
 using System.Reflection;
 #endif
 using Microsoft.AspNetCore.Mvc.ModelBinding;