diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 90a1317557..6116c09c71 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -858,6 +858,7 @@ virDomainVcpupinDefFree(virDomainVcpupinDefPtr *def,
         return;
 
     for(i = 0; i < nvcpupin; i++) {
+        VIR_FREE(def[i]->cpumask);
         VIR_FREE(def[i]);
     }