diff --git a/eleventy.config.js b/eleventy.config.js
index 1a62d3a..1f6bb32 100644
--- a/eleventy.config.js
+++ b/eleventy.config.js
@@ -21,6 +21,22 @@ export default function(eleventyConfig) {
     return `<img src=/${pathPrefix}/${filename} alt="${alt}" title="${alt}">`
   });
 
+  // Fix page sorting. By default this is by file created date? We want it to be by filename.
+  eleventyConfig.addCollection('pages', (collection) => (collection
+    .getFilteredByGlob(['site-source/index.md', 'site-source/page-*.md'])
+    .map(page => {
+      let number;
+      if (page.fileSlug == 'index') {
+        number = 0;
+      } else {
+        number = Number(page.fileSlug.slice('page-'.length));
+      }
+      return { page, number };
+    })
+    .sort((a, b) => a.number - b.number)
+    .map(p => p.page)
+  ));
+
   return {
     markdownTemplateEngine: 'njk',
     pathPrefix: pathPrefix,