diff --git a/src/listeners/increment.js b/src/listeners/increment.js
index 19bdfce..3e5d3d8 100644
--- a/src/listeners/increment.js
+++ b/src/listeners/increment.js
@@ -9,9 +9,11 @@ import { Counter } from "../classes/Counter.js";
  * @param {import("@lenra/app-server").Api} api
  * @returns 
  */
-export default async function(props, _event, api) {
+export default async function (props, _event, api) {
     let counter = await api.data.getDoc(Counter, props.id);
     counter.count += 1;
-    await api.data.updateDoc(counter);
+    await api.data.startTransaction()
+    await api.data.updateDoc(counter, true);
+    await api.data.commitTransaction()
     return {};
 }
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