diff --git a/gidocgen/gir/parser.py b/gidocgen/gir/parser.py
index e62835d..7ee60fa 100644
--- a/gidocgen/gir/parser.py
+++ b/gidocgen/gir/parser.py
@@ -288,7 +288,11 @@ class GirParser:
 
         content = child.text or ""
 
-        return ast.Doc(content=content, filename=child.attrib['filename'], line=int(child.attrib['line']))
+        return ast.Doc(
+            content=content,
+            filename=child.attrib.get('filename', ''),
+            line=int(child.attrib.get('line', 0)),
+        )
 
     def _maybe_parse_source_position(self, node: ET.Element) -> T.Optional[ast.SourcePosition]:
         child = node.find('core:source-position', GI_NAMESPACES)