diff --git a/src/obelisk/asynchronous/producer.py b/src/obelisk/asynchronous/producer.py
index b3f5b19..3851f2d 100644
--- a/src/obelisk/asynchronous/producer.py
+++ b/src/obelisk/asynchronous/producer.py
@@ -41,7 +41,7 @@ async def send(self, dataset: str, data: List[dict],
 
         params = {
             'datasetId': dataset,
-            'timestampPrecision': precision,
+            'timestampPrecision': precision.value,
             'mode': mode.value
         }