diff --git a/malloc/malloc.c b/malloc/malloc.c
index 0234d96..f2710ff 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -4091,6 +4091,9 @@ _int_malloc (mstate av, size_t bytes)
       victim = av->top;
       size = chunksize (victim);
 
+      if (__glibc_unlikely (size > av->system_mem))
+        malloc_printerr ("malloc(): corrupted top size");
+
       if ((unsigned long) (size) >= (unsigned long) (nb + MINSIZE))
         {
           remainder_size = size - nb;