diff --git a/isso/migrate.py b/isso/migrate.py
index 57bfd01..47dbecb 100644
--- a/isso/migrate.py
+++ b/isso/migrate.py
@@ -9,6 +9,11 @@ import textwrap
 from time import mktime, strptime
 from collections import defaultdict
 
+try:
+    input = raw_input
+except NameError:
+    pass
+
 try:
     from urlparse import urlparse
 except ImportError:
@@ -43,6 +48,10 @@ def insert(db, thread, posts):
 
 def disqus(db, xmlfile):
 
+    if db.execute("SELECT * FROM comments").fetchone():
+        if input("Isso DB is not empty! Continue? [y/N]: ") not in ("y", "Y"):
+            raise SystemExit("Abort.")
+
     tree = ElementTree.parse(xmlfile)
     res = defaultdict(list)