diff --git a/oxdata/poster/migrations/0004_unique_urls.py b/oxdata/poster/migrations/0004_unique_urls.py
new file mode 100644
index 0000000..13df6b1
--- /dev/null
+++ b/oxdata/poster/migrations/0004_unique_urls.py
@@ -0,0 +1,70 @@
+# encoding: utf-8
+import datetime
+from south.db import db
+from south.v2 import SchemaMigration
+from django.db import models
+
+class Migration(SchemaMigration):
+
+    def forwards(self, orm):
+        
+        # Removing unique constraint on 'PosterCache', fields ['url']
+        db.delete_unique('poster_postercache', ['url'])
+
+        # Adding unique constraint on 'PosterCache', fields ['url', 'movie_id']
+        db.create_unique('poster_postercache', ['url', 'movie_id_id'])
+
+
+    def backwards(self, orm):
+        
+        # Adding unique constraint on 'PosterCache', fields ['url']
+        db.create_unique('poster_postercache', ['url'])
+
+        # Removing unique constraint on 'PosterCache', fields ['url', 'movie_id']
+        db.delete_unique('poster_postercache', ['url', 'movie_id_id'])
+
+
+    models = {
+        'lookup.movieid': {
+            'Meta': {'object_name': 'MovieId'},
+            'amg_id': ('django.db.models.fields.IntegerField', [], {'default': 'None', 'unique': 'True', 'null': 'True', 'blank': 'True'}),
+            'created': ('django.db.models.fields.DateTimeField', [], {'auto_now_add': 'True', 'blank': 'True'}),
+            'criterion_id': ('django.db.models.fields.IntegerField', [], {'default': 'None', 'unique': 'True', 'null': 'True', 'blank': 'True'}),
+            'director': ('django.db.models.fields.CharField', [], {'default': "''", 'max_length': '1000', 'blank': 'True'}),
+            'episode': ('django.db.models.fields.IntegerField', [], {'default': '-1'}),
+            'episode_title': ('django.db.models.fields.CharField', [], {'default': "''", 'max_length': '1000', 'blank': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'imdb_id': ('django.db.models.fields.CharField', [], {'default': 'None', 'max_length': '7', 'unique': 'True', 'null': 'True', 'blank': 'True'}),
+            'impawards_id': ('django.db.models.fields.CharField', [], {'default': 'None', 'max_length': '255', 'unique': 'True', 'null': 'True', 'blank': 'True'}),
+            'modified': ('django.db.models.fields.DateTimeField', [], {'auto_now': 'True', 'blank': 'True'}),
+            'oxdb_id': ('django.db.models.fields.CharField', [], {'default': 'None', 'max_length': '42', 'unique': 'True', 'null': 'True', 'blank': 'True'}),
+            'season': ('django.db.models.fields.IntegerField', [], {'default': '-1'}),
+            'series_title': ('django.db.models.fields.CharField', [], {'default': "''", 'max_length': '1000', 'blank': 'True'}),
+            'title': ('django.db.models.fields.CharField', [], {'default': "''", 'max_length': '1000', 'blank': 'True'}),
+            'wikipedia_id': ('django.db.models.fields.CharField', [], {'default': 'None', 'max_length': '255', 'unique': 'True', 'null': 'True', 'blank': 'True'}),
+            'year': ('django.db.models.fields.CharField', [], {'default': "''", 'max_length': '4', 'blank': 'True'})
+        },
+        'poster.poster': {
+            'Meta': {'object_name': 'Poster'},
+            'created': ('django.db.models.fields.DateTimeField', [], {'auto_now_add': 'True', 'blank': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'modified': ('django.db.models.fields.DateTimeField', [], {'auto_now': 'True', 'blank': 'True'}),
+            'movie_id': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'poster'", 'to': "orm['lookup.MovieId']"}),
+            'poster': ('django.db.models.fields.files.ImageField', [], {'max_length': '255'})
+        },
+        'poster.postercache': {
+            'Meta': {'unique_together': "(('movie_id', 'url'),)", 'object_name': 'PosterCache'},
+            'created': ('django.db.models.fields.DateTimeField', [], {'auto_now_add': 'True', 'blank': 'True'}),
+            'failed': ('django.db.models.fields.BooleanField', [], {'default': 'False', 'blank': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'image': ('django.db.models.fields.files.ImageField', [], {'max_length': '255'}),
+            'modified': ('django.db.models.fields.DateTimeField', [], {'auto_now': 'True', 'blank': 'True'}),
+            'movie_id': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'postercache'", 'to': "orm['lookup.MovieId']"}),
+            'site': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'site_id': ('django.db.models.fields.CharField', [], {'max_length': '42'}),
+            'status': ('django.db.models.fields.CharField', [], {'default': "'200'", 'max_length': '1024'}),
+            'url': ('django.db.models.fields.CharField', [], {'max_length': '1024'})
+        }
+    }
+
+    complete_apps = ['poster']
diff --git a/oxdata/poster/models.py b/oxdata/poster/models.py
index 904f52c..41f50b4 100644
--- a/oxdata/poster/models.py
+++ b/oxdata/poster/models.py
@@ -50,11 +50,14 @@ def poster_path(url, filename):
     return os.path.join('posters', h[:2], h[2:4], h[4:6], name)
 
 class PosterCache(models.Model):
+    class Meta:
+        unique_together = ("movie_id", "url")
+
     created = models.DateTimeField(auto_now_add=True)
     modified = models.DateTimeField(auto_now=True)
 
     movie_id = models.ForeignKey(MovieId, related_name='postercache')
-    url = models.CharField(max_length=1024, unique=True)
+    url = models.CharField(max_length=1024)
     site = models.CharField(max_length=255)
     site_id = models.CharField(max_length=42)
     image = models.ImageField(max_length=255, upload_to=lambda i, f: poster_path(i.url.encode('utf-8'), f))
@@ -99,7 +102,7 @@ class Poster(models.Model):
 
 def getPosterUrls(m):
     def addPoster(url, site, site_id):
-        if PosterCache.objects.all().filter(url=url).count() == 0:
+        if PosterCache.objects.all().filter(url=url, movie_id=m).count() == 0:
             p = PosterCache(url=url, site=site, site_id=site_id, movie_id=m)
             p.save()
 
diff --git a/oxdata/poster/tasks.py b/oxdata/poster/tasks.py
index cbd1535..91192b4 100644
--- a/oxdata/poster/tasks.py
+++ b/oxdata/poster/tasks.py
@@ -18,7 +18,7 @@ def cronjob(**kwargs):
 def getMovieposteredb(imdb_id):
     m = getMovieIdByImdbId(imdb_id)
     def addPoster(url, site, site_id):
-        if PosterCache.objects.all().filter(url=url).count() == 0:
+        if PosterCache.objects.all().filter(url=url, movie_id=m).count() == 0:
             p = PosterCache(url=url, site=site, site_id=site_id, movie_id=m)
             p.save()
     for poster in ox.web.movieposterdb.getData(imdb_id)['posters']: