diff --git a/lib/kotlin/cross-test-server/build.gradle.kts b/lib/kotlin/cross-test-server/build.gradle.kts
index eda1ebd..57fef4f 100644
--- a/lib/kotlin/cross-test-server/build.gradle.kts
+++ b/lib/kotlin/cross-test-server/build.gradle.kts
@@ -48,12 +48,6 @@
     testImplementation("org.jetbrains.kotlin:kotlin-test-junit")
 }
 
-kotlin {
-    jvmToolchain {
-        (this as JavaToolchainSpec).languageVersion.set(JavaLanguageVersion.of(8))
-    }
-}
-
 tasks {
     application {
         applicationName = "TestServer"
@@ -68,7 +62,7 @@
 
     task<Exec>("compileThrift") {
         val thriftBin = if (hasProperty("thrift.compiler")) {
-            file(property("thrift.compiler"))
+            file(property("thrift.compiler")!!)
         } else {
             project.rootDir.resolve("../../compiler/cpp/thrift")
         }