diff --git a/src/main/java/io/github/sgtsilvio/gradle/proguard/GradleUtil.kt b/src/main/kotlin/io/github/sgtsilvio/gradle/proguard/GradleUtil.kt
similarity index 100%
rename from src/main/java/io/github/sgtsilvio/gradle/proguard/GradleUtil.kt
rename to src/main/kotlin/io/github/sgtsilvio/gradle/proguard/GradleUtil.kt
diff --git a/src/main/java/io/github/sgtsilvio/gradle/proguard/LineOutputStream.kt b/src/main/kotlin/io/github/sgtsilvio/gradle/proguard/LineOutputStream.kt
similarity index 100%
rename from src/main/java/io/github/sgtsilvio/gradle/proguard/LineOutputStream.kt
rename to src/main/kotlin/io/github/sgtsilvio/gradle/proguard/LineOutputStream.kt
diff --git a/src/main/java/io/github/sgtsilvio/gradle/proguard/ProguardExtension.kt b/src/main/kotlin/io/github/sgtsilvio/gradle/proguard/ProguardExtension.kt
similarity index 100%
rename from src/main/java/io/github/sgtsilvio/gradle/proguard/ProguardExtension.kt
rename to src/main/kotlin/io/github/sgtsilvio/gradle/proguard/ProguardExtension.kt
diff --git a/src/main/java/io/github/sgtsilvio/gradle/proguard/ProguardPlugin.kt b/src/main/kotlin/io/github/sgtsilvio/gradle/proguard/ProguardPlugin.kt
similarity index 100%
rename from src/main/java/io/github/sgtsilvio/gradle/proguard/ProguardPlugin.kt
rename to src/main/kotlin/io/github/sgtsilvio/gradle/proguard/ProguardPlugin.kt
diff --git a/src/main/java/io/github/sgtsilvio/gradle/proguard/ProguardTask.kt b/src/main/kotlin/io/github/sgtsilvio/gradle/proguard/ProguardTask.kt
similarity index 100%
rename from src/main/java/io/github/sgtsilvio/gradle/proguard/ProguardTask.kt
rename to src/main/kotlin/io/github/sgtsilvio/gradle/proguard/ProguardTask.kt