diff --git a/libc/bionic/setjmp_cookie.cpp b/libc/bionic/setjmp_cookie.cpp
index ce57fd1..3be675a 100644
--- a/libc/bionic/setjmp_cookie.cpp
+++ b/libc/bionic/setjmp_cookie.cpp
@@ -63,3 +63,7 @@
 
   return cookie & 1;
 }
+
+extern "C" __LIBC_HIDDEN__ long __bionic_setjmp_checksum_mismatch() {
+  __libc_fatal("setjmp checksum mismatch");
+}