diff --git a/build/scripts/utils.gant b/build/scripts/utils.gant
index 5fb261e5b12e..a96722fd3bb0 100644
--- a/build/scripts/utils.gant
+++ b/build/scripts/utils.gant
@@ -727,7 +727,7 @@ binding.setVariable("zipSources", { String home, String targetDir ->
   ant.delete(file: sources)
   ant.zip(destfile: sources) {
     fileset(dir: home) {
-      ["java", "groovy", "ipr", "iml", "form", "xml", "properties"].each {
+      ["java", "groovy", "ipr", "iml", "form", "xml", "properties", "kt"].each {
         include(name: "**/*.$it")
       }
       exclude(name: "**/testData/**")