diff --git a/sci-astronomy/calcmysky/calcmysky-0.3.2.ebuild b/sci-astronomy/calcmysky/calcmysky-0.3.2.ebuild
index f9634b0760a5f..e3ede195f0c94 100644
--- a/sci-astronomy/calcmysky/calcmysky-0.3.2.ebuild
+++ b/sci-astronomy/calcmysky/calcmysky-0.3.2.ebuild
@@ -16,7 +16,7 @@ LICENSE="GPL-3"
 SLOT="0/15"
 KEYWORDS="amd64 ~ppc ppc64 ~riscv ~x86"
 
-IUSE="qt5 qt6"
+IUSE="+qt5 qt6"
 REQUIRED_USE="|| ( qt5 qt6 )"
 
 DEPEND="