--- a/src/Tools/JVM/java_ext_dirs	Thu May 10 20:49:30 2012 +0200
+++ b/src/Tools/JVM/java_ext_dirs	Thu May 10 22:49:12 2012 +0200
@@ -17,7 +17,7 @@
 
 ## main
 
-isabelle_jdk java \
+isabelle_jdk java -Dfile.encoding=UTF-8 \
   -classpath "$(jvmpath "$ISABELLE_HOME/src/Tools/JVM/java_ext_dirs.jar")" \
   isabelle.Java_Ext_Dirs "$(jvmpath "$ISABELLE_HOME/lib/classes/ext")" 2>/dev/null