diff --git a/sci-physics/herwig/herwig-6.5.21.ebuild b/sci-physics/herwig/herwig-6.5.21.ebuild
index a61826408465c..63e629c6f027d 100644
--- a/sci-physics/herwig/herwig-6.5.21.ebuild
+++ b/sci-physics/herwig/herwig-6.5.21.ebuild
@@ -25,7 +25,7 @@ LICENSE="all-rights-reserved"
 RESTRICT="mirror bindist"
 
 SLOT="0"
-KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux"
+KEYWORDS="amd64 ~x86 ~amd64-linux ~x86-linux"
 IUSE="doc static-libs"
 
 RDEPEND="!sci-physics/cernlib-montecarlo[herwig]"