diff --git a/deepeval/metrics/knowledge_retention/knowledge_retention.py b/deepeval/metrics/knowledge_retention/knowledge_retention.py
index 4392df3c9..14dd83e84 100644
--- a/deepeval/metrics/knowledge_retention/knowledge_retention.py
+++ b/deepeval/metrics/knowledge_retention/knowledge_retention.py
@@ -299,7 +299,7 @@ def _generate_knowledges(
     def _calculate_score(self) -> float:
         number_of_verdicts = len(self.verdicts)
         if number_of_verdicts == 0:
-            return 0
+            return 1
 
         retention_count = 0
         for verdict in self.verdicts: