diff --git a/fints4k/build.gradle b/fints4k/build.gradle
index afa5dbd1..f731f053 100644
--- a/fints4k/build.gradle
+++ b/fints4k/build.gradle
@@ -5,12 +5,9 @@ apply plugin: 'kotlin'
 sourceCompatibility = "1.7"
 targetCompatibility = "1.7"
 
-compileKotlin {
-    kotlinOptions.jvmTarget = "1.6"
-}
-compileTestKotlin {
-    kotlinOptions.jvmTarget = "1.8"
-}
+compileKotlin.kotlinOptions.jvmTarget = "1.6"
+
+compileTestKotlin.kotlinOptions.jvmTarget = "1.8"