diff --git a/tex/latex/ngexrcs/ngexrcs.cls b/tex/latex/ngexrcs/ngexrcs.cls
index 09f75ea..26025b6 100644
--- a/tex/latex/ngexrcs/ngexrcs.cls
+++ b/tex/latex/ngexrcs/ngexrcs.cls
@@ -23,6 +23,7 @@
 \setsansfont{TeX Gyre Heros}
 \setmonofont{TeX Gyre Cursor}
 \setmathfont{Euler Math}
+\mathitalicsmode=1
 
 \setlength{\marginparwidth}{1.5\marginparwidth}
 \setlength{\fboxrule}{\heavyrulewidth}
diff --git a/tex/latex/ngsummary/ngsummary.cls b/tex/latex/ngsummary/ngsummary.cls
index 37631cb..099834a 100644
--- a/tex/latex/ngsummary/ngsummary.cls
+++ b/tex/latex/ngsummary/ngsummary.cls
@@ -21,6 +21,7 @@
 \setsansfont{TeX Gyre Heros}
 \setmonofont{TeX Gyre Cursor}
 \setmathfont{Euler Math}
+\mathitalicsmode=1
 
 \setlength{\marginparwidth}{1.5\marginparwidth}
 \setlength{\fboxrule}{\heavyrulewidth}