diff --git a/test/cases/manifest_tests b/test/cases/manifest_tests
index f61dd1ad..c0a6cbdf 100755
--- a/test/cases/manifest_tests
+++ b/test/cases/manifest_tests
@@ -330,7 +330,7 @@ def get_argparser():
         help="Git ref to checkout in the osbuild/images repository."
     )
     parser.add_argument(
-        "--osb-store",
+        "--osbuild-store",
         metavar="PATH",
         type=os.path.abspath,
         default=None,
@@ -392,7 +392,7 @@ def main():
         print(f"👷 Using working directory: {workdir}")
         os.chdir(workdir)
 
-        osbuild_store_dir = args.osb_store or os.path.join(workdir, "osbuild-store")
+        osbuild_store_dir = args.osbuild_store or os.path.join(workdir, "osbuild-store")
         os.makedirs(osbuild_store_dir, exist_ok=True)
         print(f"💾 Using osbuild store directory: {osbuild_store_dir}")