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-rw-r--r--tex/context/base/mkxl/math-ini.mkxl2
1 files changed, 1 insertions, 1 deletions
diff --git a/tex/context/base/mkxl/math-ini.mkxl b/tex/context/base/mkxl/math-ini.mkxl
index b568ef126..39eb3f31d 100644
--- a/tex/context/base/mkxl/math-ini.mkxl
+++ b/tex/context/base/mkxl/math-ini.mkxl
@@ -702,7 +702,7 @@
%definemathcommand [joinrel] {\mathrel{\mkern-3mu}}
\definemathcommand [joinrel] [rel] {\mkern-3mu}
-\chardef\c_math_strut"28
+\immutable\chardef\c_math_strut"28
% \protected\def\math_strut_htdp#1%
% {\s!height\fontcharht#1\c_math_strut