diff --git a/capella_ros_tools/importer.py b/capella_ros_tools/importer.py
index 24b27f8..4516772 100644
--- a/capella_ros_tools/importer.py
+++ b/capella_ros_tools/importer.py
@@ -158,9 +158,11 @@ def _convert_class(
             "find": {
                 "name": msg_def.name,
             },
-            "set": {
-                "description": msg_def.description,
-            },
+            "set": (
+                {"description": msg_def.description}
+                if msg_def.description
+                else {}
+            ),
             "sync": {
                 "properties": props,
             },