diff --git a/boards/static/js/thread.js b/boards/static/js/thread.js
--- a/boards/static/js/thread.js
+++ b/boards/static/js/thread.js
@@ -77,7 +77,12 @@ function addQuickReply(postId) {
 
             // If this is not OP, add reflink to the post. If there already is
             // the same reflink, don't add it again.
-            if (!post.is(':first-child') && textAreaJq.val().indexOf(postLinkRaw) < 0) {
+            var postText = textAreaJq.val();
+            if (!post.is(':first-child') && postText.indexOf(postLinkRaw) < 0) {
+                // Insert line break if none is present.
+                if (postText.length > 0 && !postText.endsWith('\n') && !postText.endsWith('\r')) {
+                    textToAdd += '\n';
+                }
                 textToAdd += postLinkRaw + '\n';
             }
 
@@ -160,4 +165,4 @@ function showQuoteButton() {
     $("#quote-button").click(function() {
         addQuickQuote();
     })
-});
\ No newline at end of file
+});