diff --git a/build.gradle b/build.gradle
index 4c683b87e6..27390ea1b7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -22,6 +22,8 @@ subprojects {
         options.encoding = "UTF-8"
     }
 
+    javadoc.options.encoding = "UTF-8"
+
     ext {
         libraries = [
                 guava: 'com.google.guava:guava:18.0',