diff --git a/src/crypto/openssl/hash.cpp b/src/crypto/openssl/hash.cpp
index 0e26334..424c46a 100644
--- a/src/crypto/openssl/hash.cpp
+++ b/src/crypto/openssl/hash.cpp
@@ -33,7 +33,7 @@ sha256_t* sha256(const unsigned char *data, std::size_t len, sha256_t* out) {
 
 sha256_t* sha256d(const unsigned char *data, std::size_t len, sha256_t* out) {
 	SHA256(data, len, out->data);
-	return (sha256_t *) SHA256(data, 32, out->data);
+	return (sha256_t *) SHA256(out->data, 32, out->data);
 }
 
 ripemd160_t* ripemd160(const unsigned char *data, std::size_t len, ripemd160_t* out) {