diff --git a/include/asm-i386/uaccess.h b/include/asm-i386/uaccess.h
index e2aa5e0..d2a4f7b 100644
--- a/include/asm-i386/uaccess.h
+++ b/include/asm-i386/uaccess.h
@@ -581,7 +581,7 @@
  * If there is a limit on the length of a valid string, you may wish to
  * consider using strnlen_user() instead.
  */
-#define strlen_user(str) strnlen_user(str, ~0UL >> 1)
+#define strlen_user(str) strnlen_user(str, LONG_MAX)
 
 long strnlen_user(const char __user *str, long n);
 unsigned long __must_check clear_user(void __user *mem, unsigned long len);