diff --git a/js/js.sourcemap/src/org/jetbrains/kotlin/js/sourceMap/SourceMap3Builder.java b/js/js.sourcemap/src/org/jetbrains/kotlin/js/sourceMap/SourceMap3Builder.kt
similarity index 100%
rename from js/js.sourcemap/src/org/jetbrains/kotlin/js/sourceMap/SourceMap3Builder.java
rename to js/js.sourcemap/src/org/jetbrains/kotlin/js/sourceMap/SourceMap3Builder.kt