diff --git a/aws_lambda_powertools/metrics/provider/cloudwatch_emf/metric_properties.py b/aws_lambda_powertools/metrics/provider/cloudwatch_emf/metric_properties.py
index ea11bb997bb..013cc37e686 100644
--- a/aws_lambda_powertools/metrics/provider/cloudwatch_emf/metric_properties.py
+++ b/aws_lambda_powertools/metrics/provider/cloudwatch_emf/metric_properties.py
@@ -30,6 +30,7 @@ class MetricUnit(Enum):
     GigabitsPerSecond = "Gigabits/Second"
     TerabitsPerSecond = "Terabits/Second"
     CountPerSecond = "Count/Second"
+    NoUnit = "None"
 
 
 class MetricResolution(Enum):