diff --git a/samples/Mvc.Client/Properties/launchSettings.json b/samples/Mvc.Client/Properties/launchSettings.json
index b2eae975..53029f9e 100644
--- a/samples/Mvc.Client/Properties/launchSettings.json
+++ b/samples/Mvc.Client/Properties/launchSettings.json
@@ -12,15 +12,13 @@
       "commandName": "IISExpress",
       "launchBrowser": true,
       "environmentVariables": {
-        "ASPNET_ENV": "Development",
-        "Hosting:Environment": "Development"
+        "ASPNETCORE_ENVIRONMENT": "Development"
       }
     },
     "web": {
       "commandName": "web",
       "environmentVariables": {
-        "ASPNET_ENV": "Development",
-        "Hosting:Environment": "Development"
+        "ASPNETCORE_ENVIRONMENT": "Development"
       }
     }
   }
diff --git a/samples/Mvc.Server/Properties/launchSettings.json b/samples/Mvc.Server/Properties/launchSettings.json
index 0659c45d..fd1157ab 100644
--- a/samples/Mvc.Server/Properties/launchSettings.json
+++ b/samples/Mvc.Server/Properties/launchSettings.json
@@ -12,15 +12,13 @@
       "commandName": "IISExpress",
       "launchBrowser": true,
       "environmentVariables": {
-        "ASPNET_ENV": "Development",
-        "Hosting:Environment": "Development"
+        "ASPNETCORE_ENVIRONMENT": "Development"
       }
     },
     "web": {
       "commandName": "web",
       "environmentVariables": {
-        "ASPNET_ENV": "Development",
-        "Hosting:Environment": "Development"
+        "ASPNETCORE_ENVIRONMENT": "Development"
       }
     }
   }