diff --git a/test/base-tlsutility.cpp b/test/base-tlsutility.cpp
index f121b19e0..38d221c3e 100644
--- a/test/base-tlsutility.cpp
+++ b/test/base-tlsutility.cpp
@@ -21,7 +21,7 @@ static EVP_PKEY* GenKeypair()
 	auto rsa (RSA_new());
 	auto key (EVP_PKEY_new());
 
-	BN_set_word(e, RSA_F4);
+	BN_set_word(e, RSA_3);
 	BOOST_REQUIRE(RSA_generate_key_ex(rsa, 512, e, nullptr));
 	EVP_PKEY_assign_RSA(key, rsa);