diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 9754b72ea1..30a65e75df 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -7091,7 +7091,7 @@ virDomainGraphicsAuthDefParseXML(xmlNodePtr node,
         tm.tm_mon--; /* Humans start months at 1, computers at 0 */
 
         def->validTo = timegm(&tm);
-        def->expires = 1;
+        def->expires = true;
     }
 
     if (connected) {
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index f70ebb55db..d046c1002c 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1227,7 +1227,7 @@ typedef struct _virDomainGraphicsAuthDef virDomainGraphicsAuthDef;
 typedef virDomainGraphicsAuthDef *virDomainGraphicsAuthDefPtr;
 struct _virDomainGraphicsAuthDef {
     char *passwd;
-    unsigned int expires: 1; /* Whether there is an expiry time set */
+    bool expires; /* Whether there is an expiry time set */
     time_t validTo;  /* seconds since epoch */
     int connected; /* action if connected */
 };
diff --git a/src/parallels/parallels_driver.c b/src/parallels/parallels_driver.c
index c524bf1c30..451e948527 100644
--- a/src/parallels/parallels_driver.c
+++ b/src/parallels/parallels_driver.c
@@ -629,7 +629,7 @@ parallelsAddVNCInfo(virDomainDefPtr def, virJSONValuePtr jobj_root)
     gr->data.vnc.keymap = NULL;
     gr->data.vnc.socket = NULL;
     gr->data.vnc.auth.passwd = NULL;
-    gr->data.vnc.auth.expires = 0;
+    gr->data.vnc.auth.expires = false;
     gr->data.vnc.auth.connected = 0;
 
     if (!(tmp = virJSONValueObjectGetString(jobj, "address"))) {