diff --git a/modules/roaringbitmap-keystore/build.gradle b/modules/roaringbitmap-keystore/build.gradle
index 7bee65c50820d..1c569179e492f 100644
--- a/modules/roaringbitmap-keystore/build.gradle
+++ b/modules/roaringbitmap-keystore/build.gradle
@@ -17,10 +17,9 @@ dependencies {
   runtimeOnly 'org.roaringbitmap:shims:0.9.49'
 }
 
-tasks {
-  javadoc {
-    options {
-      (this as CoreJavadocOptions).addStringOption('Xdoclint:none', '-quiet')
-    }
-  }
+tasks.withType(Javadoc).configureEach {
+  failOnError false
+  options.addStringOption('Xdoclint:none', '-quiet')
+  options.addStringOption('encoding', 'UTF-8')
+  options.addStringOption('charSet', 'UTF-8')
 }