diff --git a/src/pretix/base/modelimport_vouchers.py b/src/pretix/base/modelimport_vouchers.py
index 13a123fe01..8d2ef87d53 100644
--- a/src/pretix/base/modelimport_vouchers.py
+++ b/src/pretix/base/modelimport_vouchers.py
@@ -75,7 +75,7 @@ class MaxUsagesColumn(IntegerColumnMixin, ImportColumn):
         ]
 
     def clean(self, value, previous_values):
-        if value is None:
+        if value is None and previous_values.get("code"):
             raise ValidationError(_('The maximum number of usages must be set.'))
         return super().clean(value, previous_values)
 
diff --git a/src/pretix/base/models/vouchers.py b/src/pretix/base/models/vouchers.py
index 5d963f1350..52ddf138c8 100644
--- a/src/pretix/base/models/vouchers.py
+++ b/src/pretix/base/models/vouchers.py
@@ -370,10 +370,11 @@ class Voucher(LoggedModel):
                     'redeemed': redeemed
                 }
             )
-        if data.get('max_usages', 1) < data.get('min_usages', 1):
-            raise ValidationError(
-                _('The maximum number of usages may not be lower than the minimum number of usages.'),
-            )
+        if data.get('min_usages') is not None:
+            if data.get('max_usages', 1) < data.get('min_usages', 1):
+                raise ValidationError(
+                    _('The maximum number of usages may not be lower than the minimum number of usages.'),
+                )
 
     @staticmethod
     def clean_subevent(data, event):