diff --git a/libc/bionic/__vsnprintf_chk.cpp b/libc/bionic/__vsnprintf_chk.cpp
index 0fdda3e..2d3a81e 100644
--- a/libc/bionic/__vsnprintf_chk.cpp
+++ b/libc/bionic/__vsnprintf_chk.cpp
@@ -50,7 +50,7 @@
         const char *format,
         va_list va)
 {
-    if (supplied_size > dest_len_from_compiler) {
+    if (__predict_false(supplied_size > dest_len_from_compiler)) {
         __fortify_chk_fail("vsnprintf buffer overflow", 0);
     }