diff --git a/content/articles/web_fs/demo.html b/content/articles/web_fs/demo.html
index 2fcfd4f..941d561 100644
--- a/content/articles/web_fs/demo.html
+++ b/content/articles/web_fs/demo.html
@@ -140,7 +140,7 @@ <h1>Local Notes</h1>
 function generateDownloadLink(filename, content, type = "text/plain") {
 	// create virtual document
 	try {
-		var blob = new Blob([content], { type });
+		let blob = new Blob([content], { type });
 		var uri = URL.createObjectURL(blob);
 	} catch(err) { // fallback for ancient browsers
 		uri = `data:${type},${encodeURIComponent(content)}`;
@@ -152,7 +152,7 @@ <h1>Local Notes</h1>
 	el.setAttribute("href", uri);
 	return {
 		el,
-		release: () => blob && URL.revokeObjectURL(blob)
+		release: () => uri && URL.revokeObjectURL(uri)
 	};
 }
 
diff --git a/content/articles/web_fs/index.md b/content/articles/web_fs/index.md
index 953c742..c8e58d1 100644
--- a/content/articles/web_fs/index.md
+++ b/content/articles/web_fs/index.md
@@ -106,9 +106,9 @@ download the respective file instead:
 ```javascript
 function generateDownloadLink(filename, content, type = "text/plain") {
     // create virtual document
-    let blob, uri;
+    let uri;
     try {
-        blob = new Blob([content], { type });
+        let blob = new Blob([content], { type });
         uri = URL.createObjectURL(blob);
     } catch(err) { // fallback for ancient browsers
         uri = `data:${type},${encodeURIComponent(content)}`;
@@ -120,7 +120,7 @@ function generateDownloadLink(filename, content, type = "text/plain") {
     el.setAttribute("href", uri);
     return {
         el,
-        release: () => blob && URL.revokeObjectURL(blob)
+        release: () => uri && URL.revokeObjectURL(uri)
     };
 }
 ```
diff --git a/content/snippets/virtual_modules/demo.html b/content/snippets/virtual_modules/demo.html
index 3c82b05..df04099 100644
--- a/content/snippets/virtual_modules/demo.html
+++ b/content/snippets/virtual_modules/demo.html
@@ -92,9 +92,10 @@ <h1>Worker Sample</h1>
 
 function code2uri(txt, type = "text/javascript") {
 	let blob = new Blob([txt], { type });
+	let uri = URL.createObjectURL(blob);
 	return {
-		uri: URL.createObjectURL(blob),
-		release: () => URL.revokeObjectURL(blob)
+		uri,
+		release: () => URL.revokeObjectURL(uri)
 	};
 }
 
diff --git a/content/snippets/virtual_modules/index.md b/content/snippets/virtual_modules/index.md
index 2940207..eca9a24 100644
--- a/content/snippets/virtual_modules/index.md
+++ b/content/snippets/virtual_modules/index.md
@@ -19,9 +19,10 @@ respective source code:
 ```javascript
 function code2uri(txt, type = "text/javascript") {
     let blob = new Blob([txt], { type });
+    let uri = URL.createObjectURL(blob);
     return {
-        uri: URL.createObjectURL(blob),
-        release: () => URL.revokeObjectURL(blob)
+        uri,
+        release: () => URL.revokeObjectURL(uri)
     };
 }
 ```