diff --git a/src/uu/pmap/src/pmap.rs b/src/uu/pmap/src/pmap.rs
index 93c133f1..6970fd9a 100644
--- a/src/uu/pmap/src/pmap.rs
+++ b/src/uu/pmap/src/pmap.rs
@@ -33,6 +33,9 @@ mod options {
 
 #[uucore::main]
 pub fn uumain(args: impl uucore::Args) -> UResult<()> {
+    // procps-ng accepts -XX as a distinct short option. clap cannot represent a
+    // two-character short flag next to -X, so map the GNU spelling to --XX.
+    let args = args.map(|arg| if arg == "-XX" { "--XX".into() } else { arg });
     let matches = uu_app().try_get_matches_from(args)?;
 
     if matches.get_flag(options::CREATE_RC) {
diff --git a/tests/by-util/test_pmap.rs b/tests/by-util/test_pmap.rs
index b4d55b29..2de05b3d 100644
--- a/tests/by-util/test_pmap.rs
+++ b/tests/by-util/test_pmap.rs
@@ -199,14 +199,15 @@ fn test_more_extended() {
 fn test_most_extended() {
     let pid = process::id();
 
-    let arg = "--XX";
-    let result = new_ucmd!()
-        .arg(arg)
-        .arg(pid.to_string())
-        .succeeds()
-        .stdout_move_str();
+    for arg in ["--XX", "-XX"] {
+        let result = new_ucmd!()
+            .arg(arg)
+            .arg(pid.to_string())
+            .succeeds()
+            .stdout_move_str();
 
-    assert_most_extended_format(pid, &result, false, false);
+        assert_most_extended_format(pid, &result, false, false);
+    }
 }
 
 #[test]