diff --git a/ultrasonic/src/main/java/org/moire/ultrasonic/service/MediaPlayerService.java b/ultrasonic/src/main/java/org/moire/ultrasonic/service/MediaPlayerService.kt
similarity index 100%
rename from ultrasonic/src/main/java/org/moire/ultrasonic/service/MediaPlayerService.java
rename to ultrasonic/src/main/java/org/moire/ultrasonic/service/MediaPlayerService.kt