diff --git a/android/uhabits-core/src/main/java/org/isoron/uhabits/core/utils/MidnightTimer.kt b/android/uhabits-core/src/main/java/org/isoron/uhabits/core/utils/MidnightTimer.kt
index 25ee9270b..ec322e55f 100644
--- a/android/uhabits-core/src/main/java/org/isoron/uhabits/core/utils/MidnightTimer.kt
+++ b/android/uhabits-core/src/main/java/org/isoron/uhabits/core/utils/MidnightTimer.kt
@@ -29,7 +29,7 @@ import javax.inject.Inject
  * A class that emits events when a new day starts.
  */
 @AppScope
-class MidnightTimer @Inject constructor() {
+open class MidnightTimer @Inject constructor() {
     private val listeners: MutableList<MidnightListener> = LinkedList()
     private lateinit var executor: ScheduledExecutorService