1 files changed, 2 insertions, 0 deletions
diff --git a/mdbp/pbuilder.py b/mdbp/pbuilder.py
index a5f734a..7208152 100644
--- a/mdbp/pbuilder.py
+++ b/mdbp/pbuilder.py
@@ -18,6 +18,8 @@ def main() -> None:
     args = parser.parse_args()
     build = args.buildjson
 
+    if "sourcename" in build["input"]:
+        raise ValueError("building a source package by name is not supported")
     enablelog = build["output"].get("log", True)
     if build.get("lintian", {}).get("run"):
         raise ValueError("running lintian not supported")