diff --git a/Modules/_io/bytesio.c b/Modules/_io/bytesio.c
index 4a15c8e841f25f..fb66d3db0f7a1f 100644
--- a/Modules/_io/bytesio.c
+++ b/Modules/_io/bytesio.c
@@ -155,9 +155,6 @@ resize_buffer(bytesio *self, size_t size)
         alloc = size + 1;
     }
 
-    if (alloc > ((size_t)-1) / sizeof(char))
-        goto overflow;
-
     if (SHARED_BUF(self)) {
         if (unshare_buffer(self, alloc) < 0)
             return -1;