diff --git a/safekeeper/src/bin/gluegun.rs b/safekeeper/src/bin/gluegun.rs
index 40ac64248f..f0d04d4754 100644
--- a/safekeeper/src/bin/gluegun.rs
+++ b/safekeeper/src/bin/gluegun.rs
@@ -70,6 +70,7 @@ struct Args {
     datafrom: Utf8PathBuf,
     /// Path to the data directory.
     datato: Utf8PathBuf,
+    #[arg(long, default_value = "false", action=ArgAction::Set)]
     dryrun: bool,
 }