diff --git a/src/uu/uniq/src/uniq.rs b/src/uu/uniq/src/uniq.rs
index f84bfc26d..382118bdb 100644
--- a/src/uu/uniq/src/uniq.rs
+++ b/src/uu/uniq/src/uniq.rs
@@ -15,6 +15,7 @@ use std::path::Path;
 use std::str::FromStr;
 use strum_macros::{AsRefStr, EnumString};
 use uucore::display::Quotable;
+use uucore::error::{UResult, USimpleError};
 
 static ABOUT: &str = "Report or omit repeated lines.";
 pub mod options {
@@ -245,7 +246,8 @@ fn get_long_usage() -> String {
     )
 }
 
-pub fn uumain(args: impl uucore::Args) -> i32 {
+#[uucore_procs::gen_uumain]
+pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     let usage = usage();
     let long_usage = get_long_usage();
 
@@ -265,7 +267,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         2 => (files[0].clone(), files[1].clone()),
         _ => {
             // Cannot happen as clap will fail earlier
-            crash!(1, "Extra operand: {}", files[2]);
+            return Err(USimpleError::new(1, format!("Extra operand: {}", files[2])));
         }
     };
 
@@ -288,7 +290,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         &mut open_output_file(out_file_name),
     );
 
-    0
+    Ok(())
 }
 
 pub fn uu_app() -> App<'static, 'static> {