diff --git a/addons/mail/static/src/models/attachment/attachment.js b/addons/mail/static/src/models/attachment/attachment.js
index da913a77d955b12f0e0e246cc90f2ad12ed90da4..70269ce73e0654eddd9fcf709c92155858d75fb0 100644
--- a/addons/mail/static/src/models/attachment/attachment.js
+++ b/addons/mail/static/src/models/attachment/attachment.js
@@ -172,7 +172,7 @@ function factory(dependencies) {
                 return `/web/image/${this.id}?unique=1&signature=${this.checksum}&model=ir.attachment`;
             }
             if (this.fileType === 'application/pdf') {
-                return `/web/static/lib/pdfjs/web/viewer.html?file=/web/content/${this.id}?model%3Dir.attachment`;
+                return `/web/static/lib/pdfjs/web/viewer.html?file=/web/content/${this.id}?model%3Dir.attachment#pagemode=none`;
             }
             if (this.fileType && this.fileType.includes('text')) {
                 return `/web/content/${this.id}?model%3Dir.attachment`;