diff --git a/common/lib/symmath/symmath/formula.py b/common/lib/symmath/symmath/formula.py
index 355dbfd57d..e82d361d7c 100644
--- a/common/lib/symmath/symmath/formula.py
+++ b/common/lib/symmath/symmath/formula.py
@@ -84,7 +84,7 @@ def to_latex(expr):
     # sometimes get 'script(N)__B' or more complicated terms
     expr_s = re.sub(
         r'script([a-zA-Z0-9]+)',
-        '\\mathcal{\\1}',
+        r'\\mathcal{\\1}',
         expr_s
     )