diff --git a/ognibuild/debian/build.py b/ognibuild/debian/build.py
index b5524b6..63d9b50 100644
--- a/ognibuild/debian/build.py
+++ b/ognibuild/debian/build.py
@@ -210,7 +210,7 @@ def build_once(
 
 
 def gbp_dch(path):
-    subprocess.check_call(["gbp", "dch", "--ignore_branch"], cwd=path)
+    subprocess.check_call(["gbp", "dch", "--ignore-branch"], cwd=path)
 
 
 def attempt_build(