diff --git a/crates/oapi-macros/src/component.rs b/crates/oapi-macros/src/component.rs
index 7126d5308..761dfffd9 100644
--- a/crates/oapi-macros/src/component.rs
+++ b/crates/oapi-macros/src/component.rs
@@ -67,6 +67,15 @@ impl<'c> ComponentSchema {
                 deprecated_stream,
                 type_definition,
             ),
+            Some(GenericType::Set) => ComponentSchema::vec_to_tokens(
+                &mut tokens,
+                features,
+                type_tree,
+                object_name,
+                description_stream,
+                deprecated_stream,
+                type_definition,
+            ),
             #[cfg(feature = "smallvec")]
             Some(GenericType::SmallVec) => ComponentSchema::vec_to_tokens(
                 &mut tokens,
@@ -212,6 +221,8 @@ impl<'c> ComponentSchema {
             .next()
             .expect("CompnentSchema Vec should have 1 child");
 
+        let unique = matches!(type_tree.generic_type, Some(GenericType::Set));
+
         // is octet-stream
         let schema = if child
             .path
@@ -234,8 +245,16 @@ impl<'c> ComponentSchema {
                 type_definition,
             });
 
+            let unique = match unique {
+                true => quote! {
+                    .unique_items(true)
+                },
+                false => quote! {},
+            };
+
             quote! {
                 #oapi::oapi::schema::Array::new(#component_schema)
+                #unique
             }
         };
 
diff --git a/crates/oapi-macros/src/operation/mod.rs b/crates/oapi-macros/src/operation/mod.rs
index e4bf75eaa..325d0cda3 100644
--- a/crates/oapi-macros/src/operation/mod.rs
+++ b/crates/oapi-macros/src/operation/mod.rs
@@ -279,7 +279,7 @@ impl PathTypeTree for TypeTree<'_> {
     /// Check whether [`TypeTree`] is a Vec, slice, array or other supported array type
     fn is_array(&self) -> bool {
         match self.generic_type {
-            Some(GenericType::Vec) => true,
+            Some(GenericType::Vec | GenericType::Set) => true,
             Some(_) => self.children.as_ref().unwrap().iter().any(|child| child.is_array()),
             None => false,
         }
diff --git a/crates/oapi-macros/src/type_tree.rs b/crates/oapi-macros/src/type_tree.rs
index b9ad3739f..fd00c2348 100644
--- a/crates/oapi-macros/src/type_tree.rs
+++ b/crates/oapi-macros/src/type_tree.rs
@@ -199,6 +199,7 @@ impl<'t> TypeTree<'t> {
             #[cfg(feature = "indexmap")]
             "IndexMap" => Some(GenericType::Map),
             "Vec" => Some(GenericType::Vec),
+            "BTreeSet" | "HashSet" => Some(GenericType::Set),
             "LinkedList" => Some(GenericType::LinkedList),
             #[cfg(feature = "smallvec")]
             "SmallVec" => Some(GenericType::SmallVec),
@@ -273,6 +274,7 @@ pub(crate) enum ValueType {
 pub(crate) enum GenericType {
     Vec,
     LinkedList,
+    Set,
     #[cfg(feature = "smallvec")]
     SmallVec,
     Map,
diff --git a/crates/oapi/src/openapi/schema/mod.rs b/crates/oapi/src/openapi/schema/mod.rs
index eb327d294..cd9039ee4 100644
--- a/crates/oapi/src/openapi/schema/mod.rs
+++ b/crates/oapi/src/openapi/schema/mod.rs
@@ -786,10 +786,9 @@ mod tests {
         discriminator.mapping = [("int".to_string(), "#/components/schemas/MyInt".to_string())]
             .into_iter()
             .collect::<BTreeMap<_, _>>();
-        let one_of = OneOfBuilder::new()
+        let one_of = OneOf::new()
             .item(Ref::from_schema_name("MyInt"))
-            .discriminator(Some(discriminator))
-            .build();
+            .discriminator(discriminator);
         let json_value = serde_json::to_value(one_of).unwrap();
 
         assert_json_eq!(