diff --git a/4chan_x.user.js b/4chan_x.user.js
index 0cf89cbda..ef8329edb 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -4920,7 +4920,7 @@
       return Main.callbacks.push(this.node);
     },
     node: function(post) {
-      if (!post.img) {
+      if (!post.img || post.hasPdf) {
         return;
       }
       return $.on(post.img, 'mouseover', ImageHover.mouseover);
@@ -5025,7 +5025,7 @@
     },
     node: function(post) {
       var a;
-      if (!post.img) {
+      if (!post.img || post.hasPdf) {
         return;
       }
       a = post.img.parentNode;
@@ -5127,20 +5127,24 @@
       thumb.nextSibling.hidden = true;
       return $.rmClass(thumb.parentNode.parentNode.parentNode, 'image_expanded');
     },
-    expand: function(thumb, url) {
+    expand: function(thumb, src) {
       var a, img;
       if ($.x('ancestor-or-self::*[@hidden]', thumb)) {
         return;
       }
+      a = thumb.parentNode;
+      src || (src = a.href);
+      if (/\.pdf$/.test(src)) {
+        return;
+      }
       thumb.hidden = true;
       $.addClass(thumb.parentNode.parentNode.parentNode, 'image_expanded');
       if (img = thumb.nextSibling) {
         img.hidden = false;
         return;
       }
-      a = thumb.parentNode;
       img = $.el('img', {
-        src: url || a.href
+        src: src
       });
       $.on(img, 'error', ImageExpand.error);
       return $.add(a, img);
@@ -5544,7 +5548,7 @@
       }
     },
     preParse: function(node) {
-      var el, img, parentClass, post;
+      var el, img, imgParent, parentClass, post;
       parentClass = node.parentNode.className;
       el = $('.post', node);
       post = {
@@ -5563,8 +5567,10 @@
         img: false
       };
       if (img = $('img[data-md5]', el)) {
-        post.fileInfo = img.parentNode.previousElementSibling;
+        imgParent = img.parentNode;
         post.img = img;
+        post.fileInfo = imgParent.previousElementSibling;
+        post.hasPdf = /\.pdf$/.test(imgParent.href);
       }
       Main.prettify(post.blockquote);
       return post;
diff --git a/changelog b/changelog
index e692103a3..a6b2dc673 100644
--- a/changelog
+++ b/changelog
@@ -1,4 +1,6 @@
 master
+- James Campos
+  Don't expand pdfs
 - Mayhem
   Add /po/ archive redirection for threads, images and post resurrection.
   Fix quoting.
diff --git a/script.coffee b/script.coffee
index 25133576f..fb2e00925 100644
--- a/script.coffee
+++ b/script.coffee
@@ -4012,7 +4012,7 @@ ImageHover =
   init: ->
     Main.callbacks.push @node
   node: (post) ->
-    return unless post.img
+    return if (!post.img or post.hasPdf)
     $.on post.img, 'mouseover', ImageHover.mouseover
   mouseover: ->
     # Make sure to remove the previous image hover
@@ -4078,7 +4078,7 @@ ImageExpand =
     @dialog()
 
   node: (post) ->
-    return unless post.img
+    return if (!post.img or post.hasPdf)
     a = post.img.parentNode
     $.on a, 'click', ImageExpand.cb.toggle
     if ImageExpand.on and !post.el.hidden
@@ -4144,18 +4144,19 @@ ImageExpand =
     thumb.nextSibling.hidden = true
     $.rmClass thumb.parentNode.parentNode.parentNode, 'image_expanded'
 
-  expand: (thumb, url) ->
+  expand: (thumb, src) ->
     # Do not expand images of hidden/filtered replies, or already expanded pictures.
     return if $.x 'ancestor-or-self::*[@hidden]', thumb
+    a = thumb.parentNode
+    src or= a.href
+    return if /\.pdf$/.test src
     thumb.hidden = true
     $.addClass thumb.parentNode.parentNode.parentNode, 'image_expanded'
     if img = thumb.nextSibling
       # Expand already loaded picture
       img.hidden = false
       return
-    a = thumb.parentNode
-    img = $.el 'img',
-      src: url or a.href
+    img = $.el 'img', { src }
     $.on img, 'error', ImageExpand.error
     $.add a, img
 
@@ -4506,8 +4507,10 @@ Main =
     if img = $ 'img[data-md5]', el
       # Make sure to not add deleted images,
       # those do not have a data-md5 attribute.
-      post.fileInfo = img.parentNode.previousElementSibling
+      imgParent = img.parentNode
       post.img      = img
+      post.fileInfo = imgParent.previousElementSibling
+      post.hasPdf   = /\.pdf$/.test imgParent.href
     Main.prettify post.blockquote
     post
   node: (nodes, notify) ->