diff --git a/conf/intel/portage/package.keywords/00-sabayon.package.keywords b/conf/intel/portage/package.keywords/00-sabayon.package.keywords
index 6c23ea3e..b9bdb422 100644
--- a/conf/intel/portage/package.keywords/00-sabayon.package.keywords
+++ b/conf/intel/portage/package.keywords/00-sabayon.package.keywords
@@ -189,3 +189,8 @@ media-libs/freetype -~amd64 -~x86
 
 # Allow systemd and upower-0.99 friendly version
 =xfce-extra/xfce4-power-manager-1.2.0_p20140527 ** ~amd64 ~x86 amd64 x86
+
+# Use stable clhep to avoid breaking geant
+sci-physics/clhep -~amd64 -~x86
+# Allow 2.1.4.2 as it works fine
+~sci-physics/clhep-2.1.4.2 ~amd64 ~x86 amd64 x86