diff --git a/web/buildSrc/build.gradle.kts b/web/buildSrc/build.gradle.kts
index 78a04c3783c..29db9d041c2 100644
--- a/web/buildSrc/build.gradle.kts
+++ b/web/buildSrc/build.gradle.kts
@@ -25,6 +25,7 @@ dependencies {
 
 // Write kotlin.version into a file, so it can be read by karma-test-runner patch (see test-utils/conf)
 File(projectDir.resolve("build"), "kotlin.version").apply {
+    this.parentFile.mkdirs()
     val kotlinVersion = extra["kotlin.version"].toString()
     println("Writing kotlin.version=$kotlinVersion into $absolutePath")
     createNewFile()