diff --git a/packages/storage-plus/src/indexed_map.rs b/packages/storage-plus/src/indexed_map.rs
index 26531c2ea..d033c5746 100644
--- a/packages/storage-plus/src/indexed_map.rs
+++ b/packages/storage-plus/src/indexed_map.rs
@@ -278,8 +278,8 @@ mod test {
     struct DataIndexes<'a> {
         // Second arg is for storing pk
         pub name: MultiIndex<'a, (Vec<u8>, Vec<u8>), Data>,
-        pub age: UniqueIndex<'a, U32Key, Data, Vec<u8>>,
-        pub name_lastname: UniqueIndex<'a, (Vec<u8>, Vec<u8>), Data>,
+        pub age: UniqueIndex<'a, U32Key, Data, String>,
+        pub name_lastname: UniqueIndex<'a, (Vec<u8>, Vec<u8>), Data, String>,
     }
 
     // Future Note: this can likely be macro-derived
@@ -826,6 +826,35 @@ mod test {
         assert_eq!(datas[1], marias[1].1);
     }
 
+    #[test]
+    fn unique_index_composite_key_range_de() {
+        let mut store = MockStorage::new();
+        let map = build_map();
+
+        // save data
+        let (pks, datas) = save_data(&mut store, &map);
+
+        let res: StdResult<Vec<_>> = map
+            .idx
+            .name_lastname
+            .prefix(b"Maria".to_vec())
+            .range_de(&store, None, None, Order::Ascending)
+            .collect();
+        let marias = res.unwrap();
+
+        // Only two people are called "Maria"
+        let count = marias.len();
+        assert_eq!(2, count);
+
+        // The pks
+        assert_eq!(pks[0], marias[0].0);
+        assert_eq!(pks[1], marias[1].0);
+
+        // The associated data
+        assert_eq!(datas[0], marias[0].1);
+        assert_eq!(datas[1], marias[1].1);
+    }
+
     #[test]
     #[cfg(feature = "iterator")]
     fn range_de_simple_string_key() {
diff --git a/packages/storage-plus/src/indexes.rs b/packages/storage-plus/src/indexes.rs
index 1f00034d2..4b470b3a5 100644
--- a/packages/storage-plus/src/indexes.rs
+++ b/packages/storage-plus/src/indexes.rs
@@ -473,7 +473,7 @@ where
 #[cfg(feature = "iterator")]
 impl<'a, K, T, PK> UniqueIndex<'a, K, T, PK>
 where
-    PK: KeyDeserialize,
+    PK: PrimaryKey<'a> + KeyDeserialize,
     T: Serialize + DeserializeOwned + Clone,
     K: PrimaryKey<'a>,
 {
@@ -484,8 +484,8 @@ where
     pub fn prefix_range_de<'c>(
         &self,
         store: &'c dyn Storage,
-        min: Option<PrefixBound<'a, K::Prefix>>,
-        max: Option<PrefixBound<'a, K::Prefix>>,
+        min: Option<PrefixBound<'a, PK::Prefix>>,
+        max: Option<PrefixBound<'a, PK::Prefix>>,
         order: cosmwasm_std::Order,
     ) -> Box<dyn Iterator<Item = StdResult<(PK::Output, T)>> + 'c>
     where