diff --git a/media-gfx/prusaslicer/prusaslicer-9999.ebuild b/media-gfx/prusaslicer/prusaslicer-9999.ebuild
index 17e3bd5a3e47f..ddb4522b2ddc6 100644
--- a/media-gfx/prusaslicer/prusaslicer-9999.ebuild
+++ b/media-gfx/prusaslicer/prusaslicer-9999.ebuild
@@ -48,7 +48,7 @@ RDEPEND="
 	sci-libs/nlopt
 	sci-libs/opencascade:=
 	sci-mathematics/cgal:=
-	sci-mathematics/z3
+	sci-mathematics/z3:=
 	sys-apps/dbus
 	sys-libs/zlib:=
 	virtual/opengl