diff --git a/packages/devel/flex/package.mk b/packages/devel/flex/package.mk
index ff61eba96b..707b104c23 100644
--- a/packages/devel/flex/package.mk
+++ b/packages/devel/flex/package.mk
@@ -8,7 +8,7 @@ PKG_SHA256="24e611ef5a4703a191012f80c1027dc9d12555183ce0ecd46f3636e587e9b8e9"
 PKG_LICENSE="GPL"
 PKG_SITE="http://flex.sourceforge.net/"
 PKG_URL="$SOURCEFORGE_SRC/flex/$PKG_NAME-$PKG_VERSION.tar.bz2"
-PKG_DEPENDS_HOST="ccache:host m4:host autotools:host"
+PKG_DEPENDS_HOST="ccache:host m4:host autotools:host bison:host"
 PKG_DEPENDS_TARGET="toolchain"
 PKG_LONGDESC="A tool for generating programs that perform pattern-matching on text."
 PKG_TOOLCHAIN="autotools"