diff --git a/packages/SystemUI/src/com/android/systemui/keyguard/FaceAuthScreenBrightnessController.kt b/packages/SystemUI/src/com/android/systemui/keyguard/FaceAuthScreenBrightnessController.kt
index 9dcc3bb6fbdc2..a7d17e128ff32 100644
--- a/packages/SystemUI/src/com/android/systemui/keyguard/FaceAuthScreenBrightnessController.kt
+++ b/packages/SystemUI/src/com/android/systemui/keyguard/FaceAuthScreenBrightnessController.kt
@@ -177,7 +177,7 @@ open class FaceAuthScreenBrightnessController(
                     userDefinedBrightness = systemSettings.getFloat(SCREEN_BRIGHTNESS_FLOAT)
                 }
             })
-        userDefinedBrightness = systemSettings.getFloat(SCREEN_BRIGHTNESS_FLOAT)
+        userDefinedBrightness = systemSettings.getFloat(SCREEN_BRIGHTNESS_FLOAT, 1f)
     }
 
     override fun dump(fd: FileDescriptor, pw: PrintWriter, args: Array<out String>) {
diff --git a/packages/SystemUI/tests/src/com/android/systemui/keyguard/FaceAuthScreenBrightnessControllerTest.kt b/packages/SystemUI/tests/src/com/android/systemui/keyguard/FaceAuthScreenBrightnessControllerTest.kt
index 58cb0324c69a8..73a7ca93507d2 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/keyguard/FaceAuthScreenBrightnessControllerTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/keyguard/FaceAuthScreenBrightnessControllerTest.kt
@@ -87,6 +87,8 @@ class FaceAuthScreenBrightnessControllerTest : SysuiTestCase() {
             override fun createAnimator(start: Float, end: Float) = animator
         }
         `when`(systemSettings.getFloat(eq(SCREEN_BRIGHTNESS_FLOAT))).thenReturn(INITIAL_BRIGHTNESS)
+        `when`(systemSettings.getFloat(eq(SCREEN_BRIGHTNESS_FLOAT), eq(1f)))
+                .thenReturn(INITIAL_BRIGHTNESS)
         faceAuthScreenBrightnessController.attach(whiteOverlay)
         verify(keyguardUpdateMonitor).registerCallback(capture(keyguardUpdateCallback))
     }