diff --git a/sci-mathematics/gmp-ecm/gmp-ecm-7.0.4-r2.ebuild b/sci-mathematics/gmp-ecm/gmp-ecm-7.0.4-r2.ebuild
index 1fff65f0ccabd..ee5812002ccf2 100644
--- a/sci-mathematics/gmp-ecm/gmp-ecm-7.0.4-r2.ebuild
+++ b/sci-mathematics/gmp-ecm/gmp-ecm-7.0.4-r2.ebuild
@@ -17,9 +17,6 @@ IUSE="+custom-tune openmp static-libs cpu_flags_x86_sse2"
 DEPEND="dev-libs/gmp:="
 RDEPEND="${DEPEND}"
 
-# Can't both be enabled.
-REQUIRED_USE="x86-macos? ( !custom-tune )"
-
 S="${WORKDIR}/ecm-${PV}"
 
 pkg_pretend() {