diff --git a/deps/openssl/openssl/crypto/asn1/a_strex.c b/deps/openssl/openssl/crypto/asn1/a_strex.c
index ead37ac3258..bf63330f070 100644
--- a/deps/openssl/openssl/crypto/asn1/a_strex.c
+++ b/deps/openssl/openssl/crypto/asn1/a_strex.c
@@ -566,6 +566,7 @@ int ASN1_STRING_to_UTF8(unsigned char **out, ASN1_STRING *in)
 	mbflag = tag2nbyte[type];
 	if(mbflag == -1) return -1;
 	mbflag |= MBSTRING_FLAG;
+	memset(&stmp, 0, sizeof(stmp));
 	stmp.data = NULL;
 	stmp.length = 0;
 	ret = ASN1_mbstring_copy(&str, in->data, in->length, mbflag, B_ASN1_UTF8STRING);