diff --git a/opentelemetry-sdk/src/opentelemetry/sdk/metrics/aggregation.py b/opentelemetry-sdk/src/opentelemetry/sdk/metrics/aggregation.py
index 1a592db1a84..5882f8f730c 100644
--- a/opentelemetry-sdk/src/opentelemetry/sdk/metrics/aggregation.py
+++ b/opentelemetry-sdk/src/opentelemetry/sdk/metrics/aggregation.py
@@ -20,6 +20,7 @@
     AGGREGATION_TEMPORALITY_CUMULATIVE,
     AGGREGATION_TEMPORALITY_DELTA,
 )
+from opentelemetry.util._time import _time_ns
 
 
 class Aggregation(ABC):
@@ -79,6 +80,7 @@ class LastValueAggregation(Aggregation):
 
     def aggregate(self, value):
         self._value = value
+        self._timestamp = _time_ns()
 
     def collect(self):
         return self._value