diff --git a/components/libc/mmap/posix_mmap.c b/components/libc/mmap/posix_mmap.c
index 3d405aad777d02aa5d48cae9ab974e729269462e..a16ace830600c87882ce8c6303c366624dd2e98c 100644
--- a/components/libc/mmap/posix_mmap.c
+++ b/components/libc/mmap/posix_mmap.c
@@ -35,7 +35,7 @@ void *mmap(void *addr, size_t length, int prot, int flags,
         cur = lseek(fd, 0, SEEK_SET);
 
         lseek(fd, offset, SEEK_SET);
-        read_bytes = read(fd, addr, length);
+        read_bytes = read(fd, mem, length);
         if (read_bytes != length)
         {
             if (addr == RT_NULL)