diff --git a/src/uu/nproc/src/nproc.rs b/src/uu/nproc/src/nproc.rs
index 049a7ab4e..ec8aaf90a 100644
--- a/src/uu/nproc/src/nproc.rs
+++ b/src/uu/nproc/src/nproc.rs
@@ -47,13 +47,13 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         .arg(
             Arg::with_name(OPT_ALL)
                 .short("")
-                .long("all")
+                .long(OPT_ALL)
                 .help("print the number of cores available to the system"),
         )
         .arg(
             Arg::with_name(OPT_IGNORE)
                 .short("")
-                .long("ignore")
+                .long(OPT_IGNORE)
                 .takes_value(true)
                 .help("ignore up to N cores"),
         )