diff --git a/src/Microsoft.AspNetCore.Server.IISIntegration.Tools/WebConfigTransform.cs b/src/Microsoft.AspNetCore.Server.IISIntegration.Tools/WebConfigTransform.cs
index 0d62724194..6d69ac5393 100644
--- a/src/Microsoft.AspNetCore.Server.IISIntegration.Tools/WebConfigTransform.cs
+++ b/src/Microsoft.AspNetCore.Server.IISIntegration.Tools/WebConfigTransform.cs
@@ -70,7 +70,7 @@ namespace Microsoft.AspNetCore.Server.IISIntegration.Tools
 
         private static void AddApplicationBase(XElement aspNetCoreElement)
         {
-            const string appBaseKeyName = "ASPNET_APPLICATIONBASE";
+            const string appBaseKeyName = "ASPNETCORE_APPLICATIONBASE";
 
             var envVariables = GetOrCreateChild(aspNetCoreElement, "environmentVariables");
             var appBaseElement = envVariables.Elements("environmentVariable").SingleOrDefault(e =>
diff --git a/src/dotnet-publish-iis/WebConfigTransform.cs b/src/dotnet-publish-iis/WebConfigTransform.cs
index 7a0a209cbd..56ceee4ff8 100644
--- a/src/dotnet-publish-iis/WebConfigTransform.cs
+++ b/src/dotnet-publish-iis/WebConfigTransform.cs
@@ -70,7 +70,7 @@ namespace Microsoft.AspNetCore.Tools.PublishIIS
 
         private static void AddApplicationBase(XElement httpPlatformElement)
         {
-            const string appBaseKeyName = "ASPNET_APPLICATIONBASE";
+            const string appBaseKeyName = "ASPNETCORE_APPLICATIONBASE";
 
             var envVariables = GetOrCreateChild(httpPlatformElement, "environmentVariables");
             var appBaseElement = envVariables.Elements("environmentVariable").SingleOrDefault(e =>
diff --git a/test/Microsoft.AspNetCore.Server.IISIntegration.Tools.Tests/WebConfigTransformFacts.cs b/test/Microsoft.AspNetCore.Server.IISIntegration.Tools.Tests/WebConfigTransformFacts.cs
index b21aaf340e..7d56a8c3f4 100644
--- a/test/Microsoft.AspNetCore.Server.IISIntegration.Tools.Tests/WebConfigTransformFacts.cs
+++ b/test/Microsoft.AspNetCore.Server.IISIntegration.Tools.Tests/WebConfigTransformFacts.cs
@@ -14,7 +14,7 @@ namespace Microsoft.AspNetCore.Server.IISIntegration.Tools.Tests
     </handlers>
     <aspNetCore processPath=""..\test.exe"" stdoutLogEnabled=""false"" stdoutLogFile=""..\logs\stdout.log"" startupTimeLimit=""3600"">
       <environmentVariables>
-        <environmentVariable name=""ASPNET_APPLICATIONBASE"" value=""."" />
+        <environmentVariable name=""ASPNETCORE_APPLICATIONBASE"" value=""."" />
       </environmentVariables>
     </aspNetCore>
   </system.webServer>
diff --git a/test/dotnet-publish-iis.Tests/WebConfigTransformFacts.cs b/test/dotnet-publish-iis.Tests/WebConfigTransformFacts.cs
index d7bdf4ed3c..59082925f3 100644
--- a/test/dotnet-publish-iis.Tests/WebConfigTransformFacts.cs
+++ b/test/dotnet-publish-iis.Tests/WebConfigTransformFacts.cs
@@ -14,7 +14,7 @@ namespace Microsoft.AspNetCore.Tools.PublishIIS.Tests
     </handlers>
     <httpPlatform processPath=""..\test.exe"" stdoutLogEnabled=""false"" stdoutLogFile=""..\logs\stdout.log"" startupTimeLimit=""3600"">
       <environmentVariables>
-        <environmentVariable name=""ASPNET_APPLICATIONBASE"" value=""."" />
+        <environmentVariable name=""ASPNETCORE_APPLICATIONBASE"" value=""."" />
       </environmentVariables>
     </httpPlatform>
   </system.webServer>