diff --git a/services/web/app/src/Features/Compile/CompileController.mjs b/services/web/app/src/Features/Compile/CompileController.mjs
index 7af92f7e63..4fafdb13b5 100644
--- a/services/web/app/src/Features/Compile/CompileController.mjs
+++ b/services/web/app/src/Features/Compile/CompileController.mjs
@@ -303,14 +303,22 @@ const _CompileController = {
 
     // Persist quarto output flavor so the project-list badge can distinguish
     // RevealJS presentations from PDF documents without needing a compile.
-    if (status === 'success' && options.compiler === 'quarto') {
+    // options.compiler is not sent by the frontend, so we read the stored
+    // compiler from the DB. Done fire-and-forget so it never delays the response.
+    if (status === 'success') {
       const isHtml = outputFiles.some(f => f.path === 'output.html')
-      Project.updateOne(
-        { _id: projectId },
-        { quartoFlavor: isHtml ? 'revealjs' : 'pdf' }
-      ).exec().catch(err =>
-        logger.warn({ err, projectId }, 'failed to update quartoFlavor')
-      )
+      ProjectGetter.promises
+        .getProject(projectId, { compiler: 1 })
+        .then(project => {
+          if (project?.compiler !== 'quarto') return
+          return Project.updateOne(
+            { _id: projectId },
+            { quartoFlavor: isHtml ? 'revealjs' : 'pdf' }
+          ).exec()
+        })
+        .catch(err =>
+          logger.warn({ err, projectId }, 'failed to update quartoFlavor')
+        )
     }
 
     res.json({