diff --git a/build.gradle b/build.gradle
index 0e6f549..3e58a4e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -12,6 +12,10 @@ java {
     }
 }
 
+compileJava {
+    options.encoding = 'UTF-8'
+}
+
 repositories {
   // Spock releases are available from Maven Central
   mavenCentral()