diff --git a/server/build_without_gradle.sh b/server/build_without_gradle.sh
index 14534700..ddb98b21 100755
--- a/server/build_without_gradle.sh
+++ b/server/build_without_gradle.sh
@@ -68,7 +68,7 @@ done
 
 echo "Compiling java sources..."
 cd ../java
-javac -bootclasspath "$ANDROID_JAR" \
+javac -encoding UTF-8 -bootclasspath "$ANDROID_JAR" \
     -cp "$LAMBDA_JAR:$GEN_DIR" \
     -d "$CLASSES_DIR" \
     -source 1.8 -target 1.8 \