diff --git a/ktoml-core/build.gradle.kts b/ktoml-core/build.gradle.kts
index 5d0a84f6..a96770be 100644
--- a/ktoml-core/build.gradle.kts
+++ b/ktoml-core/build.gradle.kts
@@ -19,9 +19,7 @@ kotlin {
     // building jvm task only on windows
     jvm {
         compilations.all {
-            kotlinOptions {
-                jvmTarget = "11"
-            }
+            kotlinOptions.jvmTarget = "1.8"
         }
     }
 
diff --git a/ktoml-file/build.gradle.kts b/ktoml-file/build.gradle.kts
index 20c8755d..c9b307b1 100644
--- a/ktoml-file/build.gradle.kts
+++ b/ktoml-file/build.gradle.kts
@@ -11,9 +11,7 @@ kotlin {
 
     jvm {
         compilations.all {
-            kotlinOptions {
-                jvmTarget = "11"
-            }
+            kotlinOptions.jvmTarget = "1.8"
         }
     }