diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 3aefa8f335..9bf12ff599 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -3532,6 +3532,7 @@ virDomainOSDefClear(virDomainOSDef *os)
 {
     size_t i;
 
+    g_free(os->firmwareFeatures);
     g_free(os->machine);
     g_free(os->init);
     for (i = 0; os->initargv && os->initargv[i]; i++)