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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 f63827906..0b3bdf54d 100644
--- a/tex/context/base/mkxl/math-ini.mkxl
+++ b/tex/context/base/mkxl/math-ini.mkxl
@@ -1582,7 +1582,7 @@
\permanent\protected\def\mfunctionlabeltext{\math_function_handle\mathlabeltext}
\permanent\tolerant\protected\def\definemathfunction[#1]#*[#2]%
- {\frozen\defcsname#1\endcsname{\math_function_handle_label{#1}{#2}}}
+ {\frozen\protected\defcsname#1\endcsname{\math_function_handle_label{#1}{#2}}}
\protected\def\math_function_handle_label#1#2% tag settings
{\begingroup