diff --git a/src/Ocelot/DependencyInjection/ConfigurationBuilderExtensions.cs b/src/Ocelot/DependencyInjection/ConfigurationBuilderExtensions.cs
index d3409ee8..af6351ea 100644
--- a/src/Ocelot/DependencyInjection/ConfigurationBuilderExtensions.cs
+++ b/src/Ocelot/DependencyInjection/ConfigurationBuilderExtensions.cs
@@ -9,6 +9,7 @@ namespace Ocelot.DependencyInjection
     using System.Text.RegularExpressions;
     using Configuration.File;
     using Newtonsoft.Json;
+    using Microsoft.AspNetCore.Hosting;
 
     public static class ConfigurationBuilderExtensions
     {
@@ -28,37 +29,42 @@ namespace Ocelot.DependencyInjection
             return builder;
         }
 
-        public static IConfigurationBuilder AddOcelot(this IConfigurationBuilder builder)
+        public static IConfigurationBuilder AddOcelot(this IConfigurationBuilder builder, IHostingEnvironment env = null)
         {
-            return builder.AddOcelot(".");
+            return builder.AddOcelot(".", env);
         }
 
-        public static IConfigurationBuilder AddOcelot(this IConfigurationBuilder builder, string folder)
+        public static IConfigurationBuilder AddOcelot(this IConfigurationBuilder builder, string folder, IHostingEnvironment env = null)
         {
-            const string pattern = "(?i)ocelot\\.([a-zA-Z0-9]*)(\\.json)$";
+            const string primaryConfigFile = "ocelot.json";
 
-            var reg = new Regex(pattern);
+            const string globalConfigFile = "ocelot.global.json";
 
-            var files = Directory.GetFiles(folder)
-                .Where(path => reg.IsMatch(path))
+            const string subConfigPattern = @"^ocelot\.[a-zA-Z0-9]+\.json$";
+
+            string excludeConfigName = env?.EnvironmentName != null ? $"ocelot.{env.EnvironmentName}.json" : string.Empty;
+
+            var reg = new Regex(subConfigPattern, RegexOptions.IgnoreCase | RegexOptions.Singleline);
+
+            var files = new DirectoryInfo(folder)
+                .EnumerateFiles()
+                .Where(fi => reg.IsMatch(fi.Name) && (fi.Name != excludeConfigName))
                 .ToList();
 
             var fileConfiguration = new FileConfiguration();
 
             foreach (var file in files)
             {
-                // windows and unix sigh...
-                if(files.Count > 1 && (Path.GetFileName(file) == "ocelot.json"))
+                if(files.Count > 1 && file.Name.Equals(primaryConfigFile, StringComparison.OrdinalIgnoreCase))
                 {
                     continue;
                 }
 
-                var lines = File.ReadAllText(file);
+                var lines = File.ReadAllText(file.FullName);
                 
                 var config = JsonConvert.DeserializeObject<FileConfiguration>(lines);
 
-                // windows and unix sigh...
-                if (Path.GetFileName(file) == "ocelot.global.json")
+                if (file.Name.Equals(globalConfigFile, StringComparison.OrdinalIgnoreCase))
                 {
                     fileConfiguration.GlobalConfiguration = config.GlobalConfiguration;
                 }
@@ -69,9 +75,9 @@ namespace Ocelot.DependencyInjection
 
             var json = JsonConvert.SerializeObject(fileConfiguration);
 
-            File.WriteAllText("ocelot.json", json);
+            File.WriteAllText(primaryConfigFile, json);
 
-            builder.AddJsonFile("ocelot.json", false, false);
+            builder.AddJsonFile(primaryConfigFile, false, false);
 
             return builder;
         }
diff --git a/test/Ocelot.UnitTests/DependencyInjection/ConfigurationBuilderExtensionsTests.cs b/test/Ocelot.UnitTests/DependencyInjection/ConfigurationBuilderExtensionsTests.cs
index 43176e5a..da2bc341 100644
--- a/test/Ocelot.UnitTests/DependencyInjection/ConfigurationBuilderExtensionsTests.cs
+++ b/test/Ocelot.UnitTests/DependencyInjection/ConfigurationBuilderExtensionsTests.cs
@@ -9,6 +9,8 @@
     using Shouldly;
     using TestStack.BDDfy;
     using Xunit;
+    using Moq;
+    using Microsoft.AspNetCore.Hosting;
 
     public class ConfigurationBuilderExtensionsTests
     {
@@ -19,6 +21,18 @@
         private FileConfiguration _reRouteA;
         private FileConfiguration _reRouteB;
         private FileConfiguration _aggregate;
+        private FileConfiguration _envSpecific;
+
+        public ConfigurationBuilderExtensionsTests()
+        {
+            // Clean up config files before each test
+            var subConfigFiles = new DirectoryInfo(".").GetFiles("ocelot.*.json");
+
+            foreach(var config in subConfigFiles)
+            {
+                config.Delete();
+            }
+        }
 
         [Fact]
         public void should_add_base_url_to_config()
@@ -32,23 +46,33 @@
         [Fact]
         public void should_merge_files()
         {
-            this.Given(_ => GivenMultipleConfigurationFiles(""))
-                .When(_ => WhenIAddOcelotConfiguration())
+            this.Given(_ => GivenMultipleConfigurationFiles("", false))
+                .When(_ => WhenIAddOcelotConfiguration(false))
                 .Then(_ => ThenTheConfigsAreMerged())
                 .BDDfy();
         }
 
+        [Fact]
+        public void should_merge_files_except_env()
+        {
+            this.Given(_ => GivenMultipleConfigurationFiles("", true))
+                .When(_ => WhenIAddOcelotConfiguration(true))
+                .Then(_ => ThenTheConfigsAreMerged())
+                .And(_ => NotContainsEnvSpecificConfig())
+                .BDDfy();
+        }
+
         [Fact]
         public void should_merge_files_in_specific_folder()
         {
             string configFolder = "ConfigFiles";
-            this.Given(_ => GivenMultipleConfigurationFiles(configFolder))
+            this.Given(_ => GivenMultipleConfigurationFiles(configFolder, false))
                 .When(_ => WhenIAddOcelotConfigurationWithSpecificFolder(configFolder))
                 .Then(_ => ThenTheConfigsAreMerged())
                 .BDDfy();
         }
 
-        private void GivenMultipleConfigurationFiles(string folder)
+        private void GivenMultipleConfigurationFiles(string folder, bool addEnvSpecificConfig)
         {
             if (!string.IsNullOrEmpty(folder))
             {
@@ -155,7 +179,7 @@
                 {
                     new FileAggregateReRoute
                     {
-                        ReRouteKeys = new List<string> 
+                        ReRouteKeys = new List<string>
                         {
                             "KeyB",
                             "KeyBB"
@@ -164,7 +188,7 @@
                     },
                     new FileAggregateReRoute
                     {
-                        ReRouteKeys = new List<string> 
+                        ReRouteKeys = new List<string>
                         {
                             "KeyB",
                             "KeyBB"
@@ -174,6 +198,32 @@
                 }
             };
 
+            _envSpecific = new FileConfiguration
+            {
+                ReRoutes = new List<FileReRoute>
+                    {
+                        new FileReRoute
+                        {
+                            DownstreamScheme = "DownstreamSchemeSpec",
+                            DownstreamPathTemplate = "DownstreamPathTemplateSpec",
+                            Key = "KeySpec",
+                            UpstreamHost = "UpstreamHostSpec",
+                            UpstreamHttpMethod = new List<string>
+                            {
+                                "UpstreamHttpMethodSpec"
+                            },
+                            DownstreamHostAndPorts = new List<FileHostAndPort>
+                            {
+                                new FileHostAndPort
+                                {
+                                    Host = "HostSpec",
+                                    Port = 80
+                                }
+                            }
+                        }
+                    }
+            };
+
             string globalFilename = Path.Combine(folder, "ocelot.global.json");
             string reroutesAFilename = Path.Combine(folder, "ocelot.reRoutesA.json");
             string reroutesBFilename = Path.Combine(folder, "ocelot.reRoutesB.json");
@@ -183,12 +233,23 @@
             File.WriteAllText(reroutesAFilename, JsonConvert.SerializeObject(_reRouteA));
             File.WriteAllText(reroutesBFilename, JsonConvert.SerializeObject(_reRouteB));
             File.WriteAllText(aggregatesFilename, JsonConvert.SerializeObject(_aggregate));
+
+            if (addEnvSpecificConfig)
+            {
+                string envSpecificFilename = Path.Combine(folder, "ocelot.Env.json");
+                File.WriteAllText(envSpecificFilename, JsonConvert.SerializeObject(_envSpecific));
+            }
         }
 
-        private void WhenIAddOcelotConfiguration()
+        private void WhenIAddOcelotConfiguration(bool addEnv)
         {
             IConfigurationBuilder builder = new ConfigurationBuilder();
-            builder.AddOcelot();
+
+            var hostingEnvironment = new Mock<IHostingEnvironment>();
+            hostingEnvironment.SetupGet(x => x.EnvironmentName).Returns(addEnv ? "Env" : null);
+
+            builder.AddOcelot(hostingEnvironment.Object);
+
             _configRoot = builder.Build();
         }
 
@@ -235,6 +296,14 @@
             fc.Aggregates.Count.ShouldBe(_aggregate.Aggregates.Count);
         }
 
+        private void NotContainsEnvSpecificConfig()
+        {
+            var fc = (FileConfiguration)_configRoot.Get(typeof(FileConfiguration));
+            fc.ReRoutes.ShouldNotContain(x => x.DownstreamScheme == _envSpecific.ReRoutes[0].DownstreamScheme);
+            fc.ReRoutes.ShouldNotContain(x => x.DownstreamPathTemplate == _envSpecific.ReRoutes[0].DownstreamPathTemplate);
+            fc.ReRoutes.ShouldNotContain(x => x.Key == _envSpecific.ReRoutes[0].Key);
+        }
+
         private void GivenTheBaseUrl(string baseUrl)
         {
             #pragma warning disable CS0618