diff --git a/extension/read-asciidoctor.js b/extension/read-asciidoctor.js
index 6bb68d7..461a887 100644
--- a/extension/read-asciidoctor.js
+++ b/extension/read-asciidoctor.js
@@ -90,7 +90,7 @@ function extReadAsciidoc(options) {
             imgteaser: function () { return indexData.imgteaser; },
             status: function () { return file.attributes.status; },
             modedev: function () { return indexData.modeDev; },
-            canonicalUrl: function () { return subdirectory + "/" + dir + "/" + filename + ".html"; }
+            canonicalUrl: function () { return (subdirectory + "/" + dir + "/" + filename + ".html").replace('//', '/'); }
         };
         if (file.attributes.status !== 'draft') {
             file.indexData = indexData;
diff --git a/extension/read-asciidoctor.ts b/extension/read-asciidoctor.ts
index e6e9e25..e259acc 100644
--- a/extension/read-asciidoctor.ts
+++ b/extension/read-asciidoctor.ts
@@ -102,7 +102,7 @@ export function extReadAsciidoc(options: Options): Transform {
       imgteaser: () => indexData.imgteaser,
       status: () => file.attributes.status,
       modedev: () => indexData.modeDev,
-      canonicalUrl: () => `${subdirectory}/${dir}/${filename}.html`
+      canonicalUrl: () => `${subdirectory}/${dir}/${filename}.html`.replace('//', '/')
     };
 
     if (file.attributes.status !== 'draft') {