diff --git a/src/main/java/roomescape/reservation/business/ReservationWithPaymentService.java b/src/main/java/roomescape/reservation/business/ReservationWithPaymentService.kt
similarity index 100%
rename from src/main/java/roomescape/reservation/business/ReservationWithPaymentService.java
rename to src/main/java/roomescape/reservation/business/ReservationWithPaymentService.kt
diff --git a/src/test/java/roomescape/reservation/business/ReservationWithPaymentServiceTest.java b/src/test/java/roomescape/reservation/business/ReservationWithPaymentServiceTest.kt
similarity index 100%
rename from src/test/java/roomescape/reservation/business/ReservationWithPaymentServiceTest.java
rename to src/test/java/roomescape/reservation/business/ReservationWithPaymentServiceTest.kt