diff --git a/src/libopensc/aux-data.c b/src/libopensc/aux-data.c
index 78fd94bc..b6bda718 100644
--- a/src/libopensc/aux-data.c
+++ b/src/libopensc/aux-data.c
@@ -142,6 +142,10 @@ sc_aux_data_get_md_guid(struct sc_context *ctx, struct sc_auxiliary_data *aux_da
 
 	cmap_record = &aux_data->data.cmap_record;
 
+	/* Ignore silently request of '{}' frame is output buffer is too small */
+	if (!flags && *out_size < strlen((char *)cmap_record->guid) + 2)
+		flags = 1;
+
 	*guid = '\0';
 	if (!flags)
 		strcpy(guid, "{");
@@ -149,8 +153,10 @@ sc_aux_data_get_md_guid(struct sc_context *ctx, struct sc_auxiliary_data *aux_da
 	if (!flags)
 		strlcat(guid, "}", sizeof(guid));
 
-	if (*out_size < strlen(guid))
+	if (*out_size < strlen(guid))   {
+		sc_log(ctx, "aux-data: buffer too small: out_size:%i < guid-length:%i", *out_size, strlen(guid));
 		LOG_FUNC_RETURN(ctx, SC_ERROR_BUFFER_TOO_SMALL);
+	}
 
 	memset(out, 0, *out_size);
 	memcpy(out, guid, strlen(guid));
@@ -165,8 +171,6 @@ int
 sc_aux_data_get_md_flags(struct sc_context *ctx, struct sc_auxiliary_data *aux_data,
 		unsigned char *flags)
 {
-	struct sc_md_cmap_record *cmap_record = NULL;
-
 	LOG_FUNC_CALLED(ctx);
 	if(!aux_data || !flags)
 		LOG_FUNC_RETURN(ctx, SC_ERROR_INVALID_ARGUMENTS);
diff --git a/src/minidriver/minidriver.c b/src/minidriver/minidriver.c
index 45a04c5f..44ba6677 100644
--- a/src/minidriver/minidriver.c
+++ b/src/minidriver/minidriver.c
@@ -566,7 +566,7 @@ md_contguid_get_guid_from_card(PCARD_DATA pCardData, struct sc_pkcs15_object *pr
 	size_t guid_len = MAX_CONTAINER_NAME_LEN+1;
 
 	vs = (VENDOR_SPECIFIC*) pCardData->pvVendorSpecific;
-	rv = sc_pkcs15_get_object_guid(vs->p15card, prkey, 0, (unsigned char*) szGuid, &guid_len);
+	rv = sc_pkcs15_get_object_guid(vs->p15card, prkey, 1, (unsigned char*) szGuid, &guid_len);
 	if (rv)   {
 		logprintf(pCardData, 2, "md_contguid_get_guid_from_card(): error %d\n", rv);
 		return SCARD_F_INTERNAL_ERROR;
diff --git a/src/tools/pkcs15-tool.c b/src/tools/pkcs15-tool.c
index 595b1418..5b66320f 100644
--- a/src/tools/pkcs15-tool.c
+++ b/src/tools/pkcs15-tool.c
@@ -560,7 +560,7 @@ static void print_prkey_info(const struct sc_pkcs15_object *obj)
 	printf("\tID             : %s\n", sc_pkcs15_print_id(&prkey->id));
 
 	guid_len = sizeof(guid);
-	if (!sc_pkcs15_get_object_guid(p15card, obj, 0, guid, &guid_len))   {
+	if (!sc_pkcs15_get_object_guid(p15card, obj, 1, guid, &guid_len))   {
 		printf("\tMD:guid        : ");
 		if (strlen((char *)guid) == guid_len)   {
 			printf("%s\n", (char *)guid);
@@ -778,7 +778,7 @@ static void print_skey_info(const struct sc_pkcs15_object *obj)
 		printf("\tPath           : %s\n", sc_print_path(&skey->path));
 
 	guid_len = sizeof(guid);
-	if (!sc_pkcs15_get_object_guid(p15card, obj, 0, guid, &guid_len))   {
+	if (!sc_pkcs15_get_object_guid(p15card, obj, 1, guid, &guid_len))   {
 		printf("\tGUID           : %s\n", (char *)guid);
 	}