diff --git a/src/crypto/scrypt.cpp b/src/crypto/scrypt.cpp
index be5cec206e..de9f6e4c0e 100644
--- a/src/crypto/scrypt.cpp
+++ b/src/crypto/scrypt.cpp
@@ -141,8 +141,8 @@ PBKDF2_SHA256(const uint8_t *passwd, size_t passwdlen, const uint8_t *salt,
 	HMAC_SHA256_CTX PShctx, hctx;
 	size_t i;
 	uint8_t ivec[4];
-	uint8_t U[32];
-	uint8_t T[32];
+	uint8_t U[32] = {};
+	uint8_t T[32] = {};
 	uint64_t j;
 	int k;
 	size_t clen;