diff --git a/crates/colibri-daemon/src/spawner.rs b/crates/colibri-daemon/src/spawner.rs
index 77fd3d9..4b59ccd 100644
--- a/crates/colibri-daemon/src/spawner.rs
+++ b/crates/colibri-daemon/src/spawner.rs
@@ -213,8 +213,9 @@ pub fn jail_wrap(
             format!("path={path}"),
             "mount.devfs".to_string(),
             ip4_param,
-            "command".to_string(),
-            binary.to_string(),
+            // jail(8) expects command as a name=value parameter, followed by
+            // any argv for that command.
+            format!("command={binary}"),
         ];
         ("jail".to_string(), a)
     } else {
@@ -694,8 +695,7 @@ mod jail_tests {
                 "path=/var/jails/pi",
                 "mount.devfs",
                 "ip4=inherit",
-                "command",
-                "pi",
+                "command=pi",
                 "go",
             ])
         );
@@ -717,8 +717,7 @@ mod jail_tests {
                 "path=/var/jails/pi",
                 "mount.devfs",
                 "ip4.addr=10.0.0.5",
-                "command",
-                "pi",
+                "command=pi",
             ])
         );
     }