diff --git a/Makefile b/Makefile
index ec5ba980fefb994cddbd83ef6e40bb28f7fb9c48..853d556a0522c49ab00c34c71895be95a3a7b498 100644
--- a/Makefile
+++ b/Makefile
@@ -79,7 +79,7 @@ $(JAR): $(OBJS)
 	@cd $(BUILD); ${JAVAPATH}/jar cfvM ../$@ ./* ; cd ..
 
 %.class: %.java
-	${JAVAPATH}/javac --release ${JAVARELEASE} -g -classpath ${CLASSPATH}:${JUNITCLASSPATH} -Xlint:all $<
+	${JAVAPATH}/javac -encoding utf-8 --release ${JAVARELEASE} -g -classpath ${CLASSPATH}:${JUNITCLASSPATH} -Xlint:all $<
 
 doc: $(SOURCES)
 	javadoc -d doc/ $^