diff --git a/Sources/Defaults.swift b/Sources/Defaults.swift
index 8090830..d10dd2f 100644
--- a/Sources/Defaults.swift
+++ b/Sources/Defaults.swift
@@ -104,9 +104,12 @@ public extension UserDefaults {
 			return _get(key.name)
 		}
 		set {
-			if let value = newValue {
-				_set(key.name, to: value)
+			guard let value = newValue else {
+				set(nil, forKey: key.name)
+				return
 			}
+
+			_set(key.name, to: value)
 		}
 	}
 
diff --git a/Tests/DefaultsTests/DefaultsTests.swift b/Tests/DefaultsTests/DefaultsTests.swift
index 5356a99..dcf04ea 100644
--- a/Tests/DefaultsTests/DefaultsTests.swift
+++ b/Tests/DefaultsTests/DefaultsTests.swift
@@ -35,6 +35,10 @@ final class DefaultsTests: XCTestCase {
 		XCTAssertNil(UserDefaults.standard[key])
 		UserDefaults.standard[key] = true
 		XCTAssertTrue(UserDefaults.standard[key]!)
+		UserDefaults.standard[key] = nil
+		XCTAssertNil(UserDefaults.standard[key])
+		UserDefaults.standard[key] = false
+		XCTAssertFalse(UserDefaults.standard[key]!)
 	}
 
 	func testKeys() {