diff --git a/src/c3nav/mapdata/models/feature.py b/src/c3nav/mapdata/models/feature.py
index e271d83d..b51ea716 100644
--- a/src/c3nav/mapdata/models/feature.py
+++ b/src/c3nav/mapdata/models/feature.py
@@ -4,9 +4,6 @@ from django.db import models
 from django.utils.translation import ugettext_lazy as _
 from django.utils.translation import get_language
 
-from c3nav.mapdata.models.level import Level
-from c3nav.mapdata.models.package import Package
-
 from ..fields import GeometryField
 
 
@@ -36,10 +33,10 @@ class Feature(models.Model):
     TYPES = tuple((name, t.title) for name, t in FEATURE_TYPES.items())
 
     name = models.SlugField(_('feature identifier'), primary_key=True, max_length=50, help_text=_('e.g. noc'))
-    package = models.ForeignKey(Package, on_delete=models.CASCADE, related_name='features',
+    package = models.ForeignKey('Package', on_delete=models.CASCADE, related_name='features',
                                 verbose_name=_('map package'))
     feature_type = models.CharField(max_length=50, choices=TYPES)
-    level = models.ForeignKey(Level, on_delete=models.CASCADE, related_name='features',
+    level = models.ForeignKey('Level', on_delete=models.CASCADE, related_name='features',
                               verbose_name=_('level'))
     geometry = GeometryField()
 
diff --git a/src/c3nav/mapdata/models/level.py b/src/c3nav/mapdata/models/level.py
index 17f7d474..681a7432 100644
--- a/src/c3nav/mapdata/models/level.py
+++ b/src/c3nav/mapdata/models/level.py
@@ -1,8 +1,6 @@
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
 
-from c3nav.mapdata.models import Package
-
 
 class Level(models.Model):
     """
@@ -11,7 +9,7 @@ class Level(models.Model):
     name = models.SlugField(_('level name'), primary_key=True, max_length=50,
                             help_text=_('Usually just an integer (e.g. -1, 0, 1, 2)'))
     altitude = models.DecimalField(_('level altitude'), null=True, max_digits=6, decimal_places=2)
-    package = models.ForeignKey(Package, on_delete=models.CASCADE, related_name='levels',
+    package = models.ForeignKey('Package', on_delete=models.CASCADE, related_name='levels',
                                 verbose_name=_('map package'))
 
     path_regex = r'^levels/'
diff --git a/src/c3nav/mapdata/models/source.py b/src/c3nav/mapdata/models/source.py
index 0169ec2a..febd36e2 100644
--- a/src/c3nav/mapdata/models/source.py
+++ b/src/c3nav/mapdata/models/source.py
@@ -1,15 +1,13 @@
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
 
-from c3nav.mapdata.models import Package
-
 
 class Source(models.Model):
     """
     A map source, images of levels that can be useful as backgrounds for the map editor
     """
     name = models.SlugField(_('source name'), primary_key=True, max_length=50)
-    package = models.ForeignKey(Package, on_delete=models.CASCADE, related_name='sources',
+    package = models.ForeignKey('Package', on_delete=models.CASCADE, related_name='sources',
                                 verbose_name=_('map package'))
 
     bottom = models.DecimalField(_('bottom coordinate'), max_digits=6, decimal_places=2)