diff --git a/exec.c b/exec.c
index 18f8f5f557..48600e49a9 100644
--- a/exec.c
+++ b/exec.c
@@ -721,10 +721,9 @@ static void build_page_bitmap(PageDesc *p)
     int n, tb_start, tb_end;
     TranslationBlock *tb;
 
-    p->code_bitmap = qemu_malloc(TARGET_PAGE_SIZE / 8);
+    p->code_bitmap = qemu_mallocz(TARGET_PAGE_SIZE / 8);
     if (!p->code_bitmap)
         return;
-    memset(p->code_bitmap, 0, TARGET_PAGE_SIZE / 8);
 
     tb = p->first_tb;
     while (tb != NULL) {