diff --git a/pom.xml b/pom.xml
index 1d8873412c62d9de53516c18ea84a1894efabf48..3b6c6ca078e85dea7147a2c4e5bf7b2e57d6b155 100644
--- a/pom.xml
+++ b/pom.xml
@@ -361,6 +361,7 @@
         <artifactId>plantuml-maven-plugin</artifactId>
         <version>${rugged.plantuml-maven-plugin.version}</version>
         <configuration>
+          <charset>UTF-8</charset>
           <sourceFiles>
             <directory>${basedir}/src/design</directory>
             <includes>