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