diff --git a/src/meatpy/itch50/itch50_market_processor.py b/src/meatpy/itch50/itch50_market_processor.py
index bcb135f..17ff902 100644
--- a/src/meatpy/itch50/itch50_market_processor.py
+++ b/src/meatpy/itch50/itch50_market_processor.py
@@ -157,6 +157,7 @@ def process_message(
         ):
             if message.stock != self.instrument:
                 return
+            self._order_refs.add(message.order_ref)
             if self.track_lob:
                 if message.bsindicator == b"B":
                     order_type = OrderType.BID
diff --git a/uv.lock b/uv.lock
index cf452c1..dfbe331 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,5 +1,5 @@
 version = 1
-revision = 2
+revision = 3
 requires-python = ">=3.11"
 resolution-markers = [
     "python_full_version >= '3.12'",
@@ -1005,7 +1005,7 @@ wheels = [
 
 [[package]]
 name = "meatpy"
-version = "0.2.6"
+version = "0.2.8"
 source = { editable = "." }
 dependencies = [
     { name = "pyarrow" },