--- openssl_tpm_engine-0.4.2/create_tpm_key.c	2011-01-20 19:24:04.000000000 +0100
+++ openssl_tpm_engine-0.4.2.patched/create_tpm_key.c	2013-03-15 10:44:47.550761158 +0100
@@ -145,7 +145,8 @@
 	ASN1_OCTET_STRING *blob_str;
 	unsigned char	*blob_asn1 = NULL;
 	int		asn1_len;
-	char		*filename, c, *openssl_key = NULL;
+	char		*filename, *openssl_key = NULL;
+	signed char	c;
 	int		option_index, auth = 0, popup = 0, wrap = 0;
 	UINT32		enc_scheme = TSS_ES_RSAESPKCSV15;
 	UINT32		sig_scheme = TSS_SS_RSASSAPKCS1V15_DER;