diff --git a/core/models_caves.py b/core/models_caves.py
index b3520b7..87138e2 100644
--- a/core/models_caves.py
+++ b/core/models_caves.py
@@ -122,7 +122,7 @@ class Cave(TroggleModel):
         else:
             href = self.official_name.lower()
         #return settings.URL_ROOT + '/cave/' + href + '/'
-        return urllib.parse.urljoin(settings.URL_ROOT, reverse('cave',kwargs={'cave_id':href,}))
+        return urljoin(settings.URL_ROOT, reverse('cave',kwargs={'cave_id':href,}))
 
     def __str__(self, sep = ": "):
         return str("slug:"+self.slug())
@@ -387,7 +387,7 @@ class CaveDescription(TroggleModel):
             return str(self.short_name)
     
     def get_absolute_url(self):
-        return urllib.parse.urljoin(settings.URL_ROOT, reverse('cavedescription', args=(self.short_name,)))
+        return urljoin(settings.URL_ROOT, reverse('cavedescription', args=(self.short_name,)))
     
     def save(self):
         """
@@ -458,7 +458,7 @@ class LogbookEntry(TroggleModel):
         return True
 
     def get_absolute_url(self):
-        return urllib.parse.urljoin(settings.URL_ROOT, reverse('logbookentry',kwargs={'date':self.date,'slug':self.slug}))
+        return urljoin(settings.URL_ROOT, reverse('logbookentry',kwargs={'date':self.date,'slug':self.slug}))
 
     def __str__(self):
         return "%s: (%s)" % (self.date, self.title)
@@ -518,7 +518,7 @@ class QM(TroggleModel):
 
     def get_absolute_url(self):
         #return settings.URL_ROOT + '/cave/' + self.found_by.cave.kataster_number + '/' + str(self.found_by.date.year) + '-' + '%02d' %self.number
-        return urllib.parse.urljoin(settings.URL_ROOT, reverse('qm',kwargs={'cave_id':self.found_by.cave.kataster_number,'year':self.found_by.date.year,'qm_id':self.number,'grade':self.grade}))
+        return urljoin(settings.URL_ROOT, reverse('qm',kwargs={'cave_id':self.found_by.cave.kataster_number,'year':self.found_by.date.year,'qm_id':self.number,'grade':self.grade}))
 
     def get_next_by_id(self):
         return QM.objects.get(id=self.id+1)