diff --git a/libc/bionic/__memset_chk.cpp b/libc/bionic/__memset_chk.cpp
index b201ed2..f7a5f24 100644
--- a/libc/bionic/__memset_chk.cpp
+++ b/libc/bionic/__memset_chk.cpp
@@ -42,7 +42,7 @@
  * greater than 0.
  */
 extern "C" void *__memset_chk (void *dest, int c, size_t n, size_t dest_len) {
-    if (n > dest_len) {
+    if (__predict_false(n > dest_len)) {
         __fortify_chk_fail("memset buffer overflow",
                              BIONIC_EVENT_MEMSET_BUFFER_OVERFLOW);
     }