diff --git a/compiler/build.gradle b/compiler/build.gradle
index cae6f50b9..73aef6cfa 100644
--- a/compiler/build.gradle
+++ b/compiler/build.gradle
@@ -15,6 +15,8 @@ plugins {
 apply plugin: "kotlin"
 apply plugin: "java"
 
+targetCompatibility = 1.8
+sourceCompatibility = 1.8
 
 repositories {
     mavenLocal()
diff --git a/parser/build.gradle b/parser/build.gradle
index a46b4f31d..21265a88d 100644
--- a/parser/build.gradle
+++ b/parser/build.gradle
@@ -3,6 +3,9 @@ plugins {
     id 'java'
 }
 
+targetCompatibility = 1.8
+sourceCompatibility = 1.8
+
 repositories {
     mavenCentral()
 }