diff --git a/FlowCryptAppTests/ExtensionTests.swift b/FlowCryptAppTests/ExtensionTests.swift
index b3b7e4dc0..4cb4faf04 100644
--- a/FlowCryptAppTests/ExtensionTests.swift
+++ b/FlowCryptAppTests/ExtensionTests.swift
@@ -63,6 +63,14 @@ extension ExtensionTests {
 
         XCTAssertNotNil(collection?[safe: 0])
     }
+
+    func test_unique() {
+        let collection = [1, 2, 2, 3, 4, 4]
+        let uniqueCollection = collection.unique()
+
+        XCTAssertEqual(uniqueCollection, [1, 2, 3, 4])
+        XCTAssertEqual(uniqueCollection.unique(), uniqueCollection)
+    }
 }
 
 // MARK: - Calendar
diff --git a/FlowCryptCommon/Extensions/CollectionExtensions.swift b/FlowCryptCommon/Extensions/CollectionExtensions.swift
index d9306ca70..6505b39a4 100644
--- a/FlowCryptCommon/Extensions/CollectionExtensions.swift
+++ b/FlowCryptCommon/Extensions/CollectionExtensions.swift
@@ -53,6 +53,7 @@ public extension Array where Element == String {
 
 public extension Collection where Element: Hashable {
     func unique() -> [Element] {
-        return Array(Set(self))
+        var seen: Set<Element> = []
+        return filter { seen.insert($0).inserted }
     }
 }