diff --git a/netbox/ipam/models.py b/netbox/ipam/models.py
index b3f8dde75..e82126beb 100644
--- a/netbox/ipam/models.py
+++ b/netbox/ipam/models.py
@@ -323,14 +323,14 @@ class Prefix(CreatedUpdatedModel):
             self.get_status_display(),
             self.role.name if self.role else '',
             self.description,
-            self.ttl if self.ttl else '',
+            str(self.ttl) if self.ttl else '',
             self.soa_name if self.soa_name else '',
             self.soa_contact if self.soa_contact else '',
             self.soa_serial if self.soa_serial else '',
-            self.soa_refresh if self.soa_refresh else '',
-            self.soa_retry if self.soa_retry else '',
-            self.soa_expire if self.soa_expire else '',
-            self.soa_minimum if self.soa_minimum else '',
+            str(self.soa_refresh) if self.soa_refresh else '',
+            str(self.soa_retry) if self.soa_retry else '',
+            str(self.soa_expire) if self.soa_expire else '',
+            str(self.soa_minimum) if self.soa_minimum else '',
         ])
 
     @property