diff --git a/shared/logging/src/airflow_shared/logging/percent_formatter.py b/shared/logging/src/airflow_shared/logging/percent_formatter.py
index b08024621e69d..78e4b82a81034 100644
--- a/shared/logging/src/airflow_shared/logging/percent_formatter.py
+++ b/shared/logging/src/airflow_shared/logging/percent_formatter.py
@@ -50,6 +50,16 @@ def __getitem__(self, key):
         # Roughly compatible with names from https://github.com/python/cpython/blob/v3.13.7/Lib/logging/__init__.py#L571
         # Plus with ColoredLog added in
 
+        # If there is no callsite info (often for stdout/stderr), show the same sort of thing that stdlib
+        # logging would
+        # https://github.com/python/cpython/blob/d3c888b4ec15dbd7d6b6ef4f15b558af77c228af/Lib/logging/__init__.py#L1652C34-L1652C48
+        if key == "lineno":
+            return self.event.get("lineno", 0)
+        if key == "filename":
+            return self.event.get("filename", "(unknown file)")
+        if key == "funcName":
+            return self.event.get("funcName", "(unknown function)")
+
         if key in PercentFormatRender.callsite_parameters:
             return self.event.get(PercentFormatRender.callsite_parameters[key].value)
         if key == "name":
diff --git a/shared/logging/tests/logging/test_percent_formatter.py b/shared/logging/tests/logging/test_percent_formatter.py
new file mode 100644
index 0000000000000..efcafd1353a17
--- /dev/null
+++ b/shared/logging/tests/logging/test_percent_formatter.py
@@ -0,0 +1,14 @@
+from __future__ import annotations
+
+from unittest import mock
+
+from airflow_shared.logging.percent_formatter import PercentFormatRender
+
+
+class TestPercentFormatRender:
+    def test_no_callsite(self):
+        fmter = PercentFormatRender("%(filename)s:%(lineno)d %(message)s")
+
+        formatted = fmter(mock.Mock(name="Logger"), "info", {"event": "our msg"})
+
+        assert formatted == "(unknown file):0 our msg"