diff --git a/latex/yssymbols.sty b/latex/yssymbols.sty
index 4011fc0..f03ac9e 100644
--- a/latex/yssymbols.sty
+++ b/latex/yssymbols.sty
@@ -13,6 +13,7 @@
 \def\Ioo{\genint\rbr\lbr,}
 \def\Iof{\genint\rbr\rbr,}
 \def\R{\mathbb{R}}
+\def\Q{\mathbb{Q}}
 \def\N{\mathbb{N}}
 \def\Z{\mathbb{Z}}
 \def\C{\mathbb{C}}