diff --git a/latex/yssymbols.sty b/latex/yssymbols.sty
index 76bb838..3b8704c 100644
--- a/latex/yssymbols.sty
+++ b/latex/yssymbols.sty
@@ -55,8 +55,8 @@
 
 \def\nsql#1{\textbf{\sffamily #1}}
 
-\def\V{\mathup{V}}
-\def\F{\mathup{F}}
+\def\V{\ensuremath{\mathup{V}}}
+\def\F{\ensuremath{\mathup{F}}}
 
 \let\textterm\texttt
 \def\auto{\mathcal A}