diff --git a/deluge/common.py b/deluge/common.py
index 7411ae995..38d1016a8 100644
--- a/deluge/common.py
+++ b/deluge/common.py
@@ -560,6 +560,20 @@ def is_url(url):
     return url.partition('://')[0] in ("http", "https", "ftp", "udp")
 
 
+def is_infohash(infohash):
+    """
+    A check to determine if a string is a valid infohash.
+
+    Args:
+        infohash (str): The string to check.
+
+    Returns:
+        bool: True if valid infohash, False otherwise.
+
+    """
+    return len(infohash) == 40 and infohash.isalnum()
+
+
 def is_magnet(uri):
     """
     A check to determine if a uri is a valid bittorrent magnet uri
@@ -616,7 +630,7 @@ def get_magnet_info(uri):
                     except TypeError as ex:
                         log.debug("Invalid base32 magnet hash: %s, %s", xt_hash, ex)
                         break
-                elif len(xt_hash) == 40:
+                elif is_infohash(xt_hash):
                     info_hash = xt_hash.lower()
                 else:
                     break
diff --git a/deluge/tests/test_common.py b/deluge/tests/test_common.py
index 7201a7e4c..4b913e380 100644
--- a/deluge/tests/test_common.py
+++ b/deluge/tests/test_common.py
@@ -2,8 +2,8 @@ import os
 
 from twisted.trial import unittest
 
-from deluge.common import (VersionSplit, fdate, fpcnt, fpeer, fsize, fspeed, ftime, get_path_size, is_ip, is_magnet,
-                           is_url)
+from deluge.common import (VersionSplit, fdate, fpcnt, fpeer, fsize, fspeed, ftime, get_path_size, is_infohash, is_ip,
+                           is_magnet, is_url)
 from deluge.ui.util import lang
 
 
@@ -48,6 +48,9 @@ class CommonTestCase(unittest.TestCase):
     def test_is_magnet(self):
         self.failUnless(is_magnet("magnet:?xt=urn:btih:SU5225URMTUEQLDXQWRB2EQWN6KLTYKN"))
 
+    def test_is_infohash(self):
+        self.failUnless(is_infohash("2dc5d0e71a66fe69649a640d39cb00a259704973"))
+
     def test_get_path_size(self):
         self.failUnless(get_path_size(os.devnull) == 0)
         self.failUnless(get_path_size("non-existant.file") == -1)
diff --git a/deluge/ui/gtkui/addtorrentdialog.py b/deluge/ui/gtkui/addtorrentdialog.py
index d75f0f65b..871e2b791 100644
--- a/deluge/ui/gtkui/addtorrentdialog.py
+++ b/deluge/ui/gtkui/addtorrentdialog.py
@@ -663,10 +663,16 @@ class AddTorrentDialog(component.Component):
         dialog.set_default_response(gtk.RESPONSE_OK)
         dialog.set_transient_for(self.dialog)
         entry.grab_focus()
+
+        text = (gtk.clipboard_get(selection='PRIMARY').wait_for_text() or
+                gtk.clipboard_get().wait_for_text()).strip()
+        if deluge.common.is_infohash(text):
+            entry.set_text(text)
+
         dialog.show_all()
         response = dialog.run()
         infohash = entry.get_text().strip()
-        if response == gtk.RESPONSE_OK and len(infohash) == 40:
+        if response == gtk.RESPONSE_OK and deluge.common.is_infohash(infohash):
             trackers = []
             b = textview.get_buffer()
             lines = b.get_text(b.get_start_iter(), b.get_end_iter()).strip().split("\n")