diff --git a/build.gradle b/build.gradle
index 7271bafe12f616251084174045790c3af4ab9825..e87fd7ab359a4290317d89a484bf58e0c8d58b1b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -24,12 +24,12 @@ repositories {
 mainClassName = "org.sablecc.sablecc.SableCC"
 
 task javadocJar(type: Jar) {
-  classifier = 'javadoc'
+  archiveClassifier.set("javadoc")
   from javadoc
 }
 
 task sourcesJar(type: Jar) {
-  classifier = 'sources'
+  archiveClassifier.set("sources")
   from sourceSets.main.allSource
 }