diff --git a/tools/xenmon/xenbaked.c b/tools/xenmon/xenbaked.c
index 782f0c1fd1..3d9e0ed900 100644
--- a/tools/xenmon/xenbaked.c
+++ b/tools/xenmon/xenbaked.c
@@ -663,6 +663,11 @@ static void alloc_qos_data(int ncpu)
     }
     pgsize = getpagesize();
     dummy = malloc(pgsize);
+    if (!dummy) {
+        PERROR("malloc");
+        exit(EXIT_FAILURE);
+    }
+    memset(dummy, 0, pgsize);
 
     for (n=0; n<ncpu; n++) {