diff --git a/ultrasonic/src/main/java/org/moire/ultrasonic/service/CachedMusicService.kt b/ultrasonic/src/main/kotlin/org/moire/ultrasonic/service/CachedMusicService.kt
similarity index 100%
rename from ultrasonic/src/main/java/org/moire/ultrasonic/service/CachedMusicService.kt
rename to ultrasonic/src/main/kotlin/org/moire/ultrasonic/service/CachedMusicService.kt
diff --git a/ultrasonic/src/main/java/org/moire/ultrasonic/service/MusicService.kt b/ultrasonic/src/main/kotlin/org/moire/ultrasonic/service/MusicService.kt
similarity index 100%
rename from ultrasonic/src/main/java/org/moire/ultrasonic/service/MusicService.kt
rename to ultrasonic/src/main/kotlin/org/moire/ultrasonic/service/MusicService.kt
diff --git a/ultrasonic/src/main/java/org/moire/ultrasonic/service/OfflineException.kt b/ultrasonic/src/main/kotlin/org/moire/ultrasonic/service/OfflineException.kt
similarity index 100%
rename from ultrasonic/src/main/java/org/moire/ultrasonic/service/OfflineException.kt
rename to ultrasonic/src/main/kotlin/org/moire/ultrasonic/service/OfflineException.kt
diff --git a/ultrasonic/src/main/java/org/moire/ultrasonic/service/OfflineMusicService.kt b/ultrasonic/src/main/kotlin/org/moire/ultrasonic/service/OfflineMusicService.kt
similarity index 100%
rename from ultrasonic/src/main/java/org/moire/ultrasonic/service/OfflineMusicService.kt
rename to ultrasonic/src/main/kotlin/org/moire/ultrasonic/service/OfflineMusicService.kt
diff --git a/ultrasonic/src/main/java/org/moire/ultrasonic/util/TimeLimitedCache.kt b/ultrasonic/src/main/kotlin/org/moire/ultrasonic/util/TimeLimitedCache.kt
similarity index 100%
rename from ultrasonic/src/main/java/org/moire/ultrasonic/util/TimeLimitedCache.kt
rename to ultrasonic/src/main/kotlin/org/moire/ultrasonic/util/TimeLimitedCache.kt