diff --git a/doc/manual/source/the-model-file.rst b/doc/manual/source/the-model-file.rst
index 6eece73c9d3f5ea13aeca99e3f7533e4ac5454e8..7bafbe4d83b49126fc2cbd1caccf9d660e20db5a 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);