diff --git a/apps/vscode/CHANGELOG.md b/apps/vscode/CHANGELOG.md
index 1c76bf70..c6688abe 100644
--- a/apps/vscode/CHANGELOG.md
+++ b/apps/vscode/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## 1.127.0 (Unreleased)
 
 - Added a new setting `quarto.useBundledQuartoInPositron` to prefer the Quarto CLI bundled with Positron when available. This setting has precedence _between_ `quarto.path` and `quarto.usePipQuarto`, and has no effect outside of Positron (<https://github.com/quarto-dev/quarto/pull/841>).
+- Fixed a bug where previewing showed "Not Found" on Quarto files with spaces in the name in subfolders of projects (<https://github.com/quarto-dev/quarto/pull/853>).
 
 ## 1.126.0 (Release on 2025-10-08)
 
diff --git a/apps/vscode/src/providers/preview/preview.ts b/apps/vscode/src/providers/preview/preview.ts
index 586ec0ee..cacad42f 100644
--- a/apps/vscode/src/providers/preview/preview.ts
+++ b/apps/vscode/src/providers/preview/preview.ts
@@ -531,7 +531,7 @@ class PreviewManager {
         // capture preview command url and preview url
         this.previewCommandUrl_ = match[1];
         const browseMatch = this.previewOutput_.match(
-          /(Browse at|Listening on) (https?:\/\/[^\n]*)/
+          /(Browse at|Listening on)\s+(https?:\/\/[^\n]*)/
         );
         if (browseMatch) {
           // earlier versions of quarto serve didn't print out vscode urls