diff --git a/rendercv/themes/classic/Preamble.j2.tex b/rendercv/themes/classic/Preamble.j2.tex
index 7481741..0c0666e 100644
--- a/rendercv/themes/classic/Preamble.j2.tex
+++ b/rendercv/themes/classic/Preamble.j2.tex
@@ -17,6 +17,7 @@
 \definecolor{primaryColor}{RGB}{<<design.color.as_rgb_tuple()|join(", ")>>} % define primary color
 \usepackage{enumitem} % for customizing lists
 \usepackage{fontawesome5} % for using icons
+\usepackage{amsmath} % for math
 \usepackage[
     pdftitle={<<cv.name>>'s CV},
     pdfauthor={<<cv.name>>},
@@ -27,7 +28,7 @@
 \usepackage{calc} % for calculating lengths
 \usepackage{bookmark} % for bookmarks
 \usepackage{lastpage} % for getting the total number of pages
-\usepackage[default, type1]{sourcesanspro} % for using source sans pro font
+\usepackage[default, type1]{sourcesanspro} % for using source sans 3 font
 \usepackage{ifthen}
 
 % Some settings:
diff --git a/rendercv/themes/moderncv/Preamble.j2.tex b/rendercv/themes/moderncv/Preamble.j2.tex
index d52086e..56366c1 100644
--- a/rendercv/themes/moderncv/Preamble.j2.tex
+++ b/rendercv/themes/moderncv/Preamble.j2.tex
@@ -15,6 +15,8 @@
 \nopagenumbers{}
 ((* endif *))
 
+\usepackage{amsmath} % for math
+
 % adjust the page margins
 \usepackage[scale=<<design.content_scale>>]{geometry}
 \setlength{\hintscolumnwidth}{<<design.date_width>>}                % if you want to change the width of the column with the dates