diff --git a/dev-cpp/string-theory/string-theory-3.5.ebuild b/dev-cpp/string-theory/string-theory-3.5.ebuild
index 0ad4291f94889..1e683f2fff920 100644
--- a/dev-cpp/string-theory/string-theory-3.5.ebuild
+++ b/dev-cpp/string-theory/string-theory-3.5.ebuild
@@ -12,7 +12,7 @@ S="${WORKDIR}/string_theory-${PV}"
 
 LICENSE="MIT"
 SLOT="0"
-KEYWORDS="~amd64 ~arm64 ~x86"
+KEYWORDS="~amd64 ~arm64 ~ppc64 ~x86"
 IUSE="test"
 RESTRICT="!test? ( test )"