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-rw-r--r--tex/context/base/mkxl/syst-aux.mkxl2
1 files changed, 1 insertions, 1 deletions
diff --git a/tex/context/base/mkxl/syst-aux.mkxl b/tex/context/base/mkxl/syst-aux.mkxl
index ce6177b3b..c116e9d46 100644
--- a/tex/context/base/mkxl/syst-aux.mkxl
+++ b/tex/context/base/mkxl/syst-aux.mkxl
@@ -87,7 +87,7 @@
\writestatus\m!system{duplicate system namespace '#1'}\wait
\else
\global\advance\c_syst_helpers_n_of_namespaces\plusone
- \edefcsname ??#1\endcsname{\v_interfaces_prefix_template_system}%
+ \immutable\edefcsname ??#1\endcsname{\v_interfaces_prefix_template_system}%
\fi}
%D \macros