diff --git a/build.gradle b/build.gradle
index f9e976b..4522ba8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -138,6 +138,7 @@ subprojects {
 	}
 
 	javadoc {
+		options.encoding = 'UTF-8'
 		options.memberLevel = org.gradle.external.javadoc.JavadocMemberLevel.PROTECTED
 		options.author = true
 		options.header = project.name
@@ -161,6 +162,7 @@ configure(rootProject) {
 		description = "Generates aggregated Javadoc API documentation."
 		title = "${rootProject.description} ${version} API"
 
+		options.encoding = 'UTF-8'
 		options.memberLevel = org.gradle.external.javadoc.JavadocMemberLevel.PROTECTED
 		options.author = true
 		options.header = rootProject.description