diff --git a/include/mcl/bn.hpp b/include/mcl/bn.hpp
index 59f2407..0c514de 100644
--- a/include/mcl/bn.hpp
+++ b/include/mcl/bn.hpp
@@ -889,7 +889,8 @@ struct Param {
 		*pb = true;
 		return;
 #endif
-		Fp2::init();
+		Fp2::init(pb);
+		if (!*pb) return;
 		const Fp2 xi(cp.xi_a, 1);
 		g2 = Fp2::get_gTbl()[0];
 		g3 = Fp2::get_gTbl()[3];