diff --git a/doc/manual/source/the-model-file.rst b/doc/manual/source/the-model-file.rst
index 3bef5abd83c6bf4b89a3bb7911ee50e2c9e44731..778501239c43f5dd8bdb8e55586186ff1329acb9 100644
--- a/doc/manual/source/the-model-file.rst
+++ b/doc/manual/source/the-model-file.rst
@@ -86,10 +86,10 @@ observed:
   (see :ref:`macro-exp`);
 * VARIABLE_NAME (sometimes VAR_NAME) indicates a variable name
   starting with an alphabetical character and can’t contain:
-  ‘()+-\*/^=!;:@#.’ or accentuated characters;
+  ``()+-\*/^=!;:@#.`` or accentuated characters;
 * PARAMETER_NAME (sometimes PARAM_NAME) indicates a parameter name
   starting with an alphabetical character and can’t contain:
-  ‘()+-\*/^=!;:@#.’ or accentuated characters;
+  ``()+-\*/^=!;:@#.`` or accentuated characters;
 * LATEX_NAME (sometimes TEX_NAME) indicates a valid
   LaTeX expression in math mode (not including the
   dollar signs);