diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index d92fa0e..a353f64 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -1212,15 +1212,7 @@
     return head;
 }
 
-#else
-
-GuestUserList *qmp_guest_get_users(Error **errp)
-{
-    error_setg(errp, QERR_UNSUPPORTED);
-    return NULL;
-}
-
-#endif
+#endif /* HAVE_UTMPX */
 
 /* Replace escaped special characters with their real values. The replacement
  * is done in place -- returned value is in the original string.
diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index cf1ad42..0662a68 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -1414,7 +1414,8 @@
 # Since: 2.10
 ##
 { 'struct': 'GuestUser',
-  'data': { 'user': 'str', 'login-time': 'number', '*domain': 'str' } }
+  'data': { 'user': 'str', 'login-time': 'number', '*domain': 'str' },
+  'if': { 'any': ['CONFIG_WIN32', 'HAVE_UTMPX' ] } }
 
 ##
 # @guest-get-users:
@@ -1426,7 +1427,8 @@
 # Since: 2.10
 ##
 { 'command': 'guest-get-users',
-  'returns': ['GuestUser'] }
+  'returns': ['GuestUser'],
+  'if': { 'any': ['CONFIG_WIN32', 'HAVE_UTMPX' ] } }
 
 ##
 # @GuestTimezone: