diff --git a/src/util/cgroup.c b/src/util/cgroup.c
index 2e5ef46d3d..740cedf8cd 100644
--- a/src/util/cgroup.c
+++ b/src/util/cgroup.c
@@ -1395,7 +1395,7 @@ static int virCgroupKillInternal(virCgroupPtr group, int signum, virHashTablePtr
                     done = false;
                 }
 
-                virHashAddEntry(pids, (void*)pid, (void*)1);
+                ignore_value(virHashAddEntry(pids, (void*)pid, (void*)1));
             }
             VIR_FORCE_FCLOSE(fp);
         }