diff --git a/searx/webapp.py b/searx/webapp.py
index 060f60d4e..9d473a383 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -1292,7 +1292,7 @@ function modal_open(url, num)
 {
     if(lock_chat==1) return;
     prev_chat = document.getElementById('chat_talk').innerHTML;
-    if(num == 'pdf') {   document.getElementById('chat_talk').innerHTML = prev_chat+'<div class="chat_question">'+'打开链接'+'<a class="footnote">'+ PDF +'</a>'+"</div>";}
+    if(num == 'pdf') {   document.getElementById('chat_talk').innerHTML = prev_chat+'<div class="chat_question">'+'打开链接'+'<a class="footnote">'+ 'PDF' +'</a>'+"</div>";}
     else{   document.getElementById('chat_talk').innerHTML = prev_chat+'<div class="chat_question">'+'打开链接'+'<a class="footnote">'+ String(num) +'</a>'+"</div>";}
     modal.style.display = 'block';
     document.querySelector("#readability-reader").innerHTML = '';
diff --git a/searx/webapp1.py b/searx/webapp1.py
index 060f60d4e..9d473a383 100644
--- a/searx/webapp1.py
+++ b/searx/webapp1.py
@@ -1292,7 +1292,7 @@ function modal_open(url, num)
 {
     if(lock_chat==1) return;
     prev_chat = document.getElementById('chat_talk').innerHTML;
-    if(num == 'pdf') {   document.getElementById('chat_talk').innerHTML = prev_chat+'<div class="chat_question">'+'打开链接'+'<a class="footnote">'+ PDF +'</a>'+"</div>";}
+    if(num == 'pdf') {   document.getElementById('chat_talk').innerHTML = prev_chat+'<div class="chat_question">'+'打开链接'+'<a class="footnote">'+ 'PDF' +'</a>'+"</div>";}
     else{   document.getElementById('chat_talk').innerHTML = prev_chat+'<div class="chat_question">'+'打开链接'+'<a class="footnote">'+ String(num) +'</a>'+"</div>";}
     modal.style.display = 'block';
     document.querySelector("#readability-reader").innerHTML = '';