diff --git a/openssl/rsa.go b/openssl/rsa.go
index cfc6e40..b717ea9 100644
--- a/openssl/rsa.go
+++ b/openssl/rsa.go
@@ -30,6 +30,7 @@ func GenerateKeyRSA(bits int) (N, E, D, P, Q, Dp, Dq, Qinv BigInt, err error) {
 	if key == nil {
 		return bad(newOpenSSLError("EVP_PKEY_get1_RSA failed"))
 	}
+	defer C.go_openssl_RSA_free(key)
 	N, E, D = rsaGetKey(key)
 	P, Q = rsaGetFactors(key)
 	Dp, Dq, Qinv = rsaGetCRTParams(key)