diff --git a/ipywidgets_jsonschema/form.py b/ipywidgets_jsonschema/form.py
index fdf4a9f..7824625 100644
--- a/ipywidgets_jsonschema/form.py
+++ b/ipywidgets_jsonschema/form.py
@@ -931,12 +931,18 @@ def _resetter():
         # Initially call the resetter
         _resetter()
 
+        def _getter():
+            result = [h.getter() for h in elements[:element_size]]
+            if schema.get("uniqueItems", False):
+                result = list(set(result))
+            return result
+
         wrapped_vbox[0] = self._wrap_description(
             wrapped_vbox[0], schema.get("description", None)
         )
 
         return self.construct_element(
-            getter=lambda: [h.getter() for h in elements[:element_size]],
+            getter=_getter,
             setter=_setter,
             resetter=_resetter,
             widgets=wrapped_vbox,
diff --git a/tests/schemas/array-set.json b/tests/schemas/array-set.json
new file mode 100644
index 0000000..676361d
--- /dev/null
+++ b/tests/schemas/array-set.json
@@ -0,0 +1,29 @@
+{
+  "default": [],
+  "invalid": [
+    [
+      "1",
+      "1",
+      "3"
+    ]
+  ],
+  "schema": {
+    "description": "Bla bla",
+    "items": {
+      "default": "foo",
+      "type": "string"
+    },
+    "type": "array",
+    "uniqueItems": true
+  },
+  "valid": [
+    [
+      "foo"
+    ],
+    [
+      "1",
+      "2",
+      "3"
+    ]
+  ]
+}