diff --git a/testsuite/integration/src/test/java/org/keycloak/testsuite/KeycloakServer.java b/testsuite/integration/src/test/java/org/keycloak/testsuite/KeycloakServer.java
index 74bd0b831e..9f7530db7e 100755
--- a/testsuite/integration/src/test/java/org/keycloak/testsuite/KeycloakServer.java
+++ b/testsuite/integration/src/test/java/org/keycloak/testsuite/KeycloakServer.java
@@ -295,6 +295,7 @@ public class KeycloakServer {
         di.setClassLoader(getClass().getClassLoader());
         di.setContextPath("/auth");
         di.setDeploymentName("Keycloak");
+        di.setDefaultEncoding("UTF-8");
 
         di.setDefaultServletConfig(new DefaultServletConfig(true));
         di.addWelcomePage("theme/keycloak/welcome/resources/index.html");