diff --git a/python/python-syntax/src/com/jetbrains/python/PythonFoldingBuilder.java b/python/python-syntax/src/com/jetbrains/python/PythonFoldingBuilder.kt
similarity index 100%
rename from python/python-syntax/src/com/jetbrains/python/PythonFoldingBuilder.java
rename to python/python-syntax/src/com/jetbrains/python/PythonFoldingBuilder.kt