diff --git a/quickwit/rest-api-tests/scenarii/multi_splits/0001-request-optimizations.yaml b/quickwit/rest-api-tests/scenarii/multi_splits/0001-request-optimizations.yaml
index b14c6f99e95..3c224a3783c 100644
--- a/quickwit/rest-api-tests/scenarii/multi_splits/0001-request-optimizations.yaml
+++ b/quickwit/rest-api-tests/scenarii/multi_splits/0001-request-optimizations.yaml
@@ -72,7 +72,7 @@ expected:
     hits:
       - _source: {"timestamp": "2015-01-10T12:00:00Z"}
       - _source: {"timestamp": "2015-01-10T13:00:00Z"}
-      - _source: {"timestamp": "2015-01-10T14:00:00Z"}
+      - _source: {"timestamp": "2015-01-10T14:00:00.000000001Z"}
       - _source: {"timestamp": "2015-01-11T12:00:00Z"}
       - _source: {"timestamp": "2015-01-11T12:00:00Z"}
 --- # ASC + TIMESTAMP filter
@@ -129,5 +129,5 @@ expected:
       - _source: {"timestamp": "2015-01-11T12:00:00Z"}
       - _source: {"timestamp": "2015-01-11T12:00:00Z"}
       - _source: {"timestamp": "2015-01-11T12:00:00Z"}
-      - _source: {"timestamp": "2015-01-10T14:00:00Z"}
+      - _source: {"timestamp": "2015-01-10T14:00:00.000000001Z"}
 
diff --git a/quickwit/rest-api-tests/scenarii/multi_splits/_setup.quickwit.yaml b/quickwit/rest-api-tests/scenarii/multi_splits/_setup.quickwit.yaml
index 48c0f215b4d..dad2ef716cb 100644
--- a/quickwit/rest-api-tests/scenarii/multi_splits/_setup.quickwit.yaml
+++ b/quickwit/rest-api-tests/scenarii/multi_splits/_setup.quickwit.yaml
@@ -36,7 +36,7 @@ shuffle_ndjson:
   - {"timestamp": "2015-01-10T13:00:00Z"}
   - {"timestamp": "2015-01-11T12:00:00Z"}
   - {"timestamp": "2015-01-10T10:00:00Z"}
-  - {"timestamp": "2015-01-10T14:00:00Z"} # 1h later than 2.doc
+  - {"timestamp": "2015-01-10T14:00:00.000000001Z"} # 1h later than 2.doc
   - {"timestamp": "2015-01-11T12:00:00Z"}
   - {"timestamp": "2015-01-10T10:00:00Z"}
   - {"timestamp": "2015-01-10T12:00:00Z"} # 1h earlier than 2. doc