diff --git a/InvenTree/build/models.py b/InvenTree/build/models.py
index 79bedd5616..0e0068fdaf 100644
--- a/InvenTree/build/models.py
+++ b/InvenTree/build/models.py
@@ -133,6 +133,9 @@ class Build(models.Model):
         for item in self.allocated_stock.all():
             item.delete()
 
+        # Date of 'completion' is the date the build was cancelled
+        self.completion_date = datetime.now().date()
+
         self.status = self.CANCELLED
         self.save()