diff --git a/src/roman_datamodels/maker_utils/_common_meta.py b/src/roman_datamodels/maker_utils/_common_meta.py
index 7fecab86..078ac824 100644
--- a/src/roman_datamodels/maker_utils/_common_meta.py
+++ b/src/roman_datamodels/maker_utils/_common_meta.py
@@ -675,7 +675,7 @@ def mk_mosaic_basic(**kwargs):
     mosbasic["telescope"] = kwargs.get("telescope", "ROMAN")
     mosbasic["location_name"] = kwargs.get("location_name", NOSTR)
     mosbasic["product_type"] = kwargs.get("product_type", NOSTR)
-
+    mosbasic["filename"] = kwargs.get("filename", NOSTR)
 
     return mosbasic
 
diff --git a/tests/test_stnode.py b/tests/test_stnode.py
index e428a84e..42864e25 100644
--- a/tests/test_stnode.py
+++ b/tests/test_stnode.py
@@ -350,6 +350,7 @@ def test_node_representation(model):
                     "telescope": "ROMAN",
                     "location_name": "dummy value",
                     "product_type": "dummy value",
+                    "filename": "dummy value",
                 }
             )
         else: