diff --git a/src/Compiler/Config/ConfigIncludeLoader.cs b/src/Compiler/Config/ConfigIncludeLoader.cs
index d00ad394..f8709ad6 100644
--- a/src/Compiler/Config/ConfigIncludeLoader.cs
+++ b/src/Compiler/Config/ConfigIncludeLoader.cs
@@ -1,8 +1,10 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using Compiler.Exception;
 using Compiler.Input.Rule;
+using Compiler.Input.Sorter;
 using Compiler.Output;
 using Newtonsoft.Json.Linq;
 
@@ -103,8 +105,9 @@ string configFilePath
 
                 // Get the airport folders
                 string configFileFolder = GetFolderForConfigFile(configFilePath);
-                string[] directories =
-                    Directory.GetDirectories(configFileFolder + Path.DirectorySeparatorChar + configItem.Key);
+                var directories = Directory
+                    .GetDirectories(configFileFolder + Path.DirectorySeparatorChar + configItem.Key)
+                    .OrderBy(directory => directory, new AlphabeticalPathSorter()).ToList();
 
                 /*
                  * Airports are a bit special as there are lots of them.
diff --git a/tests/CompilerTest/Config/ConfigIncludeLoaderTest.cs b/tests/CompilerTest/Config/ConfigIncludeLoaderTest.cs
index 198f116c..57052446 100644
--- a/tests/CompilerTest/Config/ConfigIncludeLoaderTest.cs
+++ b/tests/CompilerTest/Config/ConfigIncludeLoaderTest.cs
@@ -12,6 +12,7 @@
 using Compiler.Input.Rule;
 using Compiler.Output;
 using Newtonsoft.Json.Linq;
+using Xunit.Abstractions;
 using FileExists = Compiler.Input.Validator.FileExists;
 
 namespace CompilerTest.Config
@@ -20,11 +21,13 @@ public class ConfigIncludeLoaderTest
     {
         private readonly ConfigIncludeLoader fileLoader;
         private readonly ConfigInclusionRules includes;
+        private readonly ITestOutputHelper output;
 
-        public ConfigIncludeLoaderTest()
+        public ConfigIncludeLoaderTest(ITestOutputHelper output)
         {
             fileLoader = ConfigIncludeLoaderFactory.Make(new CompilerArguments());
             includes = new ConfigInclusionRules();
+            this.output = output;
         }
 
         [Theory]