diff --git a/constants/12a.md b/constants/12a.md
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+++ b/constants/12a.md
@@ -3,7 +3,7 @@
 
 ## Description of constant
 
-$C_{12} = \beta_{2}$ is the constant such that the length $L_{n}$ of the shortest tour through $n$ independent uniform random points satisfies $L_{n}/\sqrt{n}\to \beta_{2}$ almost surely.
+$C\_{12} = \beta\_{2}$ is the constant such that the length $L\_{n}$ of the shortest tour through $n$ independent uniform random points satisfies $L\_{n}/\sqrt{n}\to \beta\_{2}$ almost surely.
 
 ## Known upper bounds