diff --git a/flashcards/models.py b/flashcards/models.py
index e9aee37..f6d11fc 100644
--- a/flashcards/models.py
+++ b/flashcards/models.py
@@ -224,6 +224,7 @@ class UserFlashcard(Model):
             self.last_interval = 6
         else:
             self.last_response_factor = min(1.3, self.last_response_factor + (0.1 - (5 - q) * (0.08 + (5 - q) * 0.02)))
+            self.last_interval += (now() - self.next_review).days
             self.last_interval = int(round(self.last_interval * self.last_response_factor))
         self.next_review = user_flashcard_quiz.when + timedelta(days=self.last_interval)
         self.save()