diff --git a/package.mask/all b/package.mask/all
index 95730d2..1948f21 100644
--- a/package.mask/all
+++ b/package.mask/all
@@ -5,7 +5,6 @@
 >=dev-scheme/guile-2.2
 >media-fonts/noto-20170403
 =media-libs/netpbm-10.76.00
->=sys-devel/bison-3.7
 >=www-client/firefox-bin-69
 >www-client/opera-13
 >=x11-wm/fvwm-2.6.8