diff --git a/time4j-android/build.gradle b/time4j-android/build.gradle
index f202293..b39a373 100644
--- a/time4j-android/build.gradle
+++ b/time4j-android/build.gradle
@@ -73,11 +73,11 @@ task javadoc(type: Javadoc) {
 
 task sourcesJar(type: Jar) {
     from android.sourceSets.main.java.srcDirs
-    classifier = 'sources'
+    archiveClassifier.set("sources")
 }
 
 task javadocJar(type: Jar, dependsOn: javadoc) {
-    classifier = 'javadoc'
+    archiveClassifier.set("javadoc")
     from javadoc.destinationDir
 }