diff --git a/core/src/main/java/org/nwapw/abacus/context/ChainAccumulateDelegate.kt b/core/src/main/kotlin/org/nwapw/abacus/context/ChainAccumulateDelegate.kt
similarity index 100%
rename from core/src/main/java/org/nwapw/abacus/context/ChainAccumulateDelegate.kt
rename to core/src/main/kotlin/org/nwapw/abacus/context/ChainAccumulateDelegate.kt
diff --git a/core/src/main/java/org/nwapw/abacus/context/ChainSearchDelegate.kt b/core/src/main/kotlin/org/nwapw/abacus/context/ChainSearchDelegate.kt
similarity index 100%
rename from core/src/main/java/org/nwapw/abacus/context/ChainSearchDelegate.kt
rename to core/src/main/kotlin/org/nwapw/abacus/context/ChainSearchDelegate.kt
diff --git a/core/src/main/java/org/nwapw/abacus/context/MutableReductionContext.kt b/core/src/main/kotlin/org/nwapw/abacus/context/MutableReductionContext.kt
similarity index 100%
rename from core/src/main/java/org/nwapw/abacus/context/MutableReductionContext.kt
rename to core/src/main/kotlin/org/nwapw/abacus/context/MutableReductionContext.kt
diff --git a/core/src/main/java/org/nwapw/abacus/context/ReductionContext.kt b/core/src/main/kotlin/org/nwapw/abacus/context/ReductionContext.kt
similarity index 100%
rename from core/src/main/java/org/nwapw/abacus/context/ReductionContext.kt
rename to core/src/main/kotlin/org/nwapw/abacus/context/ReductionContext.kt