diff --git a/src/uu/sysctl/src/sysctl.rs b/src/uu/sysctl/src/sysctl.rs
index 7a3d9e96..eef80099 100644
--- a/src/uu/sysctl/src/sysctl.rs
+++ b/src/uu/sysctl/src/sysctl.rs
@@ -234,11 +234,13 @@ pub fn uu_app() -> Command {
         .arg(
             Arg::new("noop_o")
                 .short('o')
+                .action(ArgAction::SetTrue)
                 .help("Does nothing, for BSD compatibility"),
         )
         .arg(
             Arg::new("noop_x")
                 .short('x')
+                .action(ArgAction::SetTrue)
                 .help("Does nothing, for BSD compatibility"),
         )
 }
diff --git a/tests/by-util/test_sysctl.rs b/tests/by-util/test_sysctl.rs
index 100a13e2..23c7fcc5 100644
--- a/tests/by-util/test_sysctl.rs
+++ b/tests/by-util/test_sysctl.rs
@@ -118,6 +118,28 @@ mod linux {
             .code_is(1)
             .no_stdout();
     }
+
+    // procps-ng treats -o and -x as no-op flags (BSD compatibility), not options
+    // that take a value. Without SetTrue, clap would consume the next operand.
+    #[test]
+    fn test_noop_flags_do_not_take_a_value() {
+        new_ucmd!()
+            .args(&["-o", "kernel.ostype"])
+            .succeeds()
+            .stdout_is("kernel.ostype = Linux\n");
+        new_ucmd!()
+            .args(&["-x", "kernel.ostype"])
+            .succeeds()
+            .stdout_is("kernel.ostype = Linux\n");
+        new_ucmd!()
+            .args(&["-o", "-n", "kernel.ostype"])
+            .succeeds()
+            .stdout_is("Linux\n");
+        new_ucmd!()
+            .args(&["-ox", "kernel.ostype"])
+            .succeeds()
+            .stdout_is("kernel.ostype = Linux\n");
+    }
 }
 
 #[cfg(not(target_os = "linux"))]