diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/references/BuiltInsReferenceResolver.java b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/references/BuiltInsReferenceResolver.kt
similarity index 100%
rename from idea/idea-analysis/src/org/jetbrains/kotlin/idea/references/BuiltInsReferenceResolver.java
rename to idea/idea-analysis/src/org/jetbrains/kotlin/idea/references/BuiltInsReferenceResolver.kt