diff --git a/docling/backend/asciidoc_backend.py b/docling/backend/asciidoc_backend.py
index c6a0d18938..644e48f46e 100644
--- a/docling/backend/asciidoc_backend.py
+++ b/docling/backend/asciidoc_backend.py
@@ -414,10 +414,14 @@ def _parse_picture(line):
 
             # Extract optional attributes (alt text, width, height, alignment)
             if attributes:
-                picture_info["alt"] = attributes[0].strip() if attributes[0] else ""
+                alt_parts = [attributes[0].strip()] if attributes[0] else [""]
                 for attr in attributes[1:]:
-                    key, value = attr.split("=")
-                    picture_info[key.strip()] = value.strip()
+                    if "=" in attr:
+                        key, value = attr.split("=", 1)
+                        picture_info[key.strip()] = value.strip()
+                    else:
+                        alt_parts.append(attr.strip())
+                picture_info["alt"] = ", ".join(alt_parts)
 
             return picture_info
 
diff --git a/tests/test_backend_asciidoc.py b/tests/test_backend_asciidoc.py
index 4decdff74b..aedcfb9b17 100644
--- a/tests/test_backend_asciidoc.py
+++ b/tests/test_backend_asciidoc.py
@@ -39,6 +39,17 @@ def test_parse_picture():
     assert "height" not in res
     assert res.get("uri", "") == "renamed-bookmark.png"
 
+    line = "image::images/screenshot.png[A screenshot showing a dialog box, containing text fields, buttons, and validation errors, width=604, height=422]"
+    res = AsciiDocBackend._parse_picture(line)
+    assert res
+    assert res.get("width", 0) == "604"
+    assert res.get("height", 0) == "422"
+    assert res.get("uri", "") == "images/screenshot.png"
+    assert (
+        res.get("alt", "")
+        == "A screenshot showing a dialog box, containing text fields, buttons, and validation errors"
+    )
+
 
 def test_asciidocs_examples():
     fnames = sorted(glob.glob("./tests/data/asciidoc/*.asciidoc"))