diff --git a/src/preview/viewer.ts b/src/preview/viewer.ts
index 4f6cd7234..039cfe9fc 100644
--- a/src/preview/viewer.ts
+++ b/src/preview/viewer.ts
@@ -30,7 +30,7 @@ export { serializer } from './viewer/pdfviewerpanel'
 export { hook } from './viewer/pdfviewerhook'
 
 lw.watcher.pdf.onChange(pdfPath => {
-    if (lw.compile.compiling && path.relative(lw.compile.compiledPDFPath, pdfPath) !== '') {
+    if (!lw.compile.compiling || path.relative(lw.compile.compiledPDFPath, pdfPath) !== '') {
         refresh(pdfPath)
     }
 })