diff --git a/UniTest/synthetic/SyntheticDataset.py b/UniTest/synthetic/SyntheticDataset.py
index 23e06c77cf9ac5f31f9645c688b2cd5ac4a9d99c..4d05c50d3bd5e773a8797f70d6af8b9b2224a417 100644
--- a/UniTest/synthetic/SyntheticDataset.py
+++ b/UniTest/synthetic/SyntheticDataset.py
@@ -100,8 +100,8 @@ def create_synthetic_hic_bams(
             segment2 = pysam.AlignedSegment(header_obj)
 
             # Nom de lecture identique
-            segment1.query_name = f"read{i}"
-            segment2.query_name = f"read{i}"
+            segment1.query_name = f"read{i}:01"
+            segment2.query_name = f"read{i}:01"
 
             if random.random() < 0.5:
                 segment1.flag = 0