diff --git a/script/cosmasvc2koralquery b/script/cosmasvc2koralquery
index 4c3e5b0..e3edd5f 100755
--- a/script/cosmasvc2koralquery
+++ b/script/cosmasvc2koralquery
@@ -6,6 +6,8 @@
 use lib 'lib';
 use Getopt::Long;
 
+binmode(STDERR, ':encoding(UTF-8)');
+
 # 2020-05-20
 #   Preliminary support for C2 def-files.
 # 2020-05-29