diff --git a/lib/src/parse.rs b/lib/src/parse.rs
index 75bedab2..a7b4f87c 100644
--- a/lib/src/parse.rs
+++ b/lib/src/parse.rs
@@ -3,7 +3,7 @@ use indexmap::IndexMap;
 use itertools::Itertools;
 use log::trace;
 use miette::bail;
-use std::collections::{BTreeMap, HashMap, VecDeque};
+use std::collections::{BTreeMap, HashMap, HashSet, VecDeque};
 use std::fmt::{Debug, Display, Formatter};
 use std::sync::Arc;
 use strum::EnumTryAs;
@@ -117,6 +117,15 @@ fn flag_keys(flag: &SpecFlag) -> Vec<String> {
     keys
 }
 
+fn unique_flags<'a>(
+    flags: impl IntoIterator<Item = &'a Arc<SpecFlag>>,
+) -> impl Iterator<Item = &'a Arc<SpecFlag>> {
+    let mut seen = HashSet::new();
+    flags
+        .into_iter()
+        .filter(move |flag| seen.insert(Arc::as_ptr(flag) as usize))
+}
+
 /// Extract the flag key from a flag word for lookup in available_flags map
 /// Handles both long flags (--flag, --flag=value) and short flags (-f)
 fn get_flag_key(word: &str) -> &str {
@@ -704,7 +713,7 @@ fn parse_partial_with_env(
         }
     }
 
-    for flag in out.available_flags.values() {
+    for flag in unique_flags(out.available_flags.values()) {
         if out.flags.contains_key(flag) {
             continue;
         }
diff --git a/lib/tests/parse.rs b/lib/tests/parse.rs
index e743deb8..31264941 100644
--- a/lib/tests/parse.rs
+++ b/lib/tests/parse.rs
@@ -30,6 +30,11 @@ required_flag:
     args="",
     expected=r#"Missing required flag: --name <name>"#,
 
+required_flag_with_short_alias:
+    spec=r#"flag "-n --name <name>" required=#true"#,
+    args="",
+    expected=r#"Missing required flag: --name <name>"#,
+
 negate:
     spec=r#"flag "--force" negate="--no-force""#,
     args="--no-force",