diff --git a/RxScreenProtectKitTests/RxScreenProtectKitTests.swift b/RxScreenProtectKitTests/RxScreenProtectKitTests.swift
index ee2d326..ac480c7 100644
--- a/RxScreenProtectKitTests/RxScreenProtectKitTests.swift
+++ b/RxScreenProtectKitTests/RxScreenProtectKitTests.swift
@@ -187,12 +187,17 @@ final class RxScreenProtectKitTests: XCTestCase {
     }
 
     func testSPLabel() {
+        let changeTextExpectation: XCTestExpectation? = self.expectation(description: "Change Text")
         let label = SPLabel()
         label.layoutSubviews()
         XCTAssertEqual(label.text, nil)
         label.text = "original"
         label.protectText = "protect"
-        XCTAssertEqual(label.text, "original")
+        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
+            XCTAssertEqual(label.text, "original")
+            changeTextExpectation?.fulfill()
+        }
+        self.waitForExpectations(timeout: 1, handler: nil)
     }
 
     func testPixelBoxSize() {
diff --git a/Source/SPLabel.swift b/Source/SPLabel.swift
index 676209d..1f0ac51 100644
--- a/Source/SPLabel.swift
+++ b/Source/SPLabel.swift
@@ -14,16 +14,18 @@ public final class SPLabel: UILabel {
     private var original: String?
     /// Specify the character string to be replaced during recording.
     /// If nothing is specified, `nil` is assigned to `text` when a recording is detected.
-    public var protectText: String?
+    public var protectText: String? {
+        didSet {
+            load.onNext(())
+        }
+    }
     /// The current text that is displayed by the label.
     /// Please note that when recording, a different string will be returned from the original string.
     override public var text: String? {
         set {
             super.text = newValue
             original = newValue
-            if newValue != nil {
-                load.onNext(())
-            }
+            load.onNext(())
         }
         get {
             return super.text