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diff --git src/providers/ad/ad_common.c src/providers/ad/ad_common.c
index 0d154ca57..407d37a37 100644
--- src/providers/ad/ad_common.c
+++ src/providers/ad/ad_common.c
@@ -419,7 +419,7 @@ ad_get_common_options(TALLOC_CTX *mem_ctx,
char *server;
char *realm;
char *ad_hostname;
- char hostname[HOST_NAME_MAX + 1];
+ char hostname[_POSIX_HOST_NAME_MAX + 1];
char *case_sensitive_opt;
const char *opt_override;
@@ -458,7 +458,7 @@ ad_get_common_options(TALLOC_CTX *mem_ctx,
*/
ad_hostname = dp_opt_get_string(opts->basic, AD_HOSTNAME);
if (ad_hostname == NULL) {
- gret = gethostname(hostname, sizeof(hostname));
+ gret = gethostname(hostname, _POSIX_HOST_NAME_MAX);
if (gret != 0) {
ret = errno;
DEBUG(SSSDBG_FATAL_FAILURE,
@@ -466,7 +466,7 @@ ad_get_common_options(TALLOC_CTX *mem_ctx,
strerror(ret));
goto done;
}
- hostname[HOST_NAME_MAX] = '\0';
+ hostname[_POSIX_HOST_NAME_MAX] = '\0';
DEBUG(SSSDBG_CONF_SETTINGS,
"Setting ad_hostname to [%s].\n", hostname);
ret = dp_opt_set_string(opts->basic, AD_HOSTNAME, hostname);
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