diff --git a/src/Microsoft.AspNetCore.Server.IISIntegration/WebHostBuilderIISExtensions.cs b/src/Microsoft.AspNetCore.Server.IISIntegration/WebHostBuilderIISExtensions.cs
index 2a09eed46b..8a92946ae1 100644
--- a/src/Microsoft.AspNetCore.Server.IISIntegration/WebHostBuilderIISExtensions.cs
+++ b/src/Microsoft.AspNetCore.Server.IISIntegration/WebHostBuilderIISExtensions.cs
@@ -91,7 +91,7 @@ namespace Microsoft.AspNetCore.Hosting
                     }
                 }
 
-                var address = "http://localhost:" + port;
+                var address = "http://127.0.0.1:" + port;
                 hostBuilder.CaptureStartupErrors(true);
 
                 hostBuilder.ConfigureServices(services =>
diff --git a/test/Microsoft.AspNetCore.Server.IISIntegration.Tests/IISMiddlewareTests.cs b/test/Microsoft.AspNetCore.Server.IISIntegration.Tests/IISMiddlewareTests.cs
index d282c07c10..0898b7ae21 100644
--- a/test/Microsoft.AspNetCore.Server.IISIntegration.Tests/IISMiddlewareTests.cs
+++ b/test/Microsoft.AspNetCore.Server.IISIntegration.Tests/IISMiddlewareTests.cs
@@ -252,7 +252,7 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
             // Adds a server and calls Build()
             var server = new TestServer(builder);
 
-            Assert.Equal("http://localhost:12345", builder.GetSetting(WebHostDefaults.ServerUrlsKey));
+            Assert.Equal("http://127.0.0.1:12345", builder.GetSetting(WebHostDefaults.ServerUrlsKey));
             Assert.Equal("true", builder.GetSetting(WebHostDefaults.PreferHostingUrlsKey));
         }
 
@@ -270,7 +270,7 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
                 });
             new TestServer(builder);
 
-            Assert.Equal("http://localhost:12345", builder.GetSetting(WebHostDefaults.ServerUrlsKey));
+            Assert.Equal("http://127.0.0.1:12345", builder.GetSetting(WebHostDefaults.ServerUrlsKey));
         }
 
         [Fact]