diff --git a/src/memheap.c b/src/memheap.c
index b466acb437..1c7d1de0ed 100644
--- a/src/memheap.c
+++ b/src/memheap.c
@@ -619,6 +619,7 @@ void rt_memheap_free(void *ptr)
         RT_ASSERT(header_ptr->magic == (RT_MEMHEAP_MAGIC | RT_MEMHEAP_USED));
         /* check whether this block of memory has been over-written. */
         RT_ASSERT((header_ptr->next->magic & RT_MEMHEAP_MASK) == RT_MEMHEAP_MAGIC);
+        return;
     }
 
     /* get pool ptr */