diff --git a/src/crypto/crypto_openssl.c b/src/crypto/crypto_openssl.c
index a74681fd7..fde154faf 100644
--- a/src/crypto/crypto_openssl.c
+++ b/src/crypto/crypto_openssl.c
@@ -653,7 +653,8 @@ err:
 	DH *dh;
 	struct wpabuf *pubkey = NULL, *privkey = NULL;
 	size_t publen, privlen;
-	BIGNUM *p = NULL, *g, *priv_key = NULL, *pub_key = NULL;
+	BIGNUM *p = NULL, *g;
+	const BIGNUM *priv_key = NULL, *pub_key = NULL;
 
 	*priv = NULL;
 	wpabuf_free(*publ);