diff --git a/bn256/bn256_test.go b/bn256/bn256_test.go
index 343a15b..e8dc5bf 100644
--- a/bn256/bn256_test.go
+++ b/bn256/bn256_test.go
@@ -180,7 +180,7 @@ func TestRandomG2(t *testing.T) {
 		_, g2, _ := RandomG2(rand.Reader)
 		po := new(twistPoint).Mul(g2.p, Order)
 		if !po.IsInfinity() {
-			t.Errorf("pt * Order is not infinity: %s", g2.p)
+			t.Errorf("pt * Order is not infinity: %v", g2.p)
 		}
 	}
 }
diff --git a/bn256/gfp2_test.go b/bn256/gfp2_test.go
index 271eacf..d0c07c0 100644
--- a/bn256/gfp2_test.go
+++ b/bn256/gfp2_test.go
@@ -93,7 +93,7 @@ func expectEqual(t *testing.T, a *fp2e, A *bn256ref.GFp2) {
 		t.Fatalf("got nil, want %s", A)
 	}
 	if a != nil && A == nil {
-		t.Fatalf("want nil, got %s", a)
+		t.Fatalf("want nil, got %v", a)
 	}
 	if a != nil && A != nil {
 		if !A.Eq(a.Ref()) {