diff --git a/inclusive_django_range_fields/forms.py b/inclusive_django_range_fields/forms.py
index 6e0b01a..e242c8c 100644
--- a/inclusive_django_range_fields/forms.py
+++ b/inclusive_django_range_fields/forms.py
@@ -5,7 +5,8 @@ class BaseInclusiveRangeFormField(BaseRangeField):
 
     def compress(self, values):
         values = super().compress(values)
-        values._bounds = "[]"
+        if value is not None:
+            values._bounds = "[]"
         return values