diff --git a/src/uu/nice/src/nice.rs b/src/uu/nice/src/nice.rs
index ddd804cf2..dd507e33f 100644
--- a/src/uu/nice/src/nice.rs
+++ b/src/uu/nice/src/nice.rs
@@ -190,6 +190,8 @@ pub fn uu_app() -> Command {
                 .short('n')
                 .long(options::ADJUSTMENT)
                 .help("add N to the niceness (default is 10)")
+                .action(ArgAction::Set)
+                .overrides_with(options::ADJUSTMENT)
                 .allow_hyphen_values(true),
         )
         .arg(