diff --git a/libc/tools/check-symbols-glibc.py b/libc/tools/check-symbols-glibc.py
index 27b92c4..c5dbdcf 100755
--- a/libc/tools/check-symbols-glibc.py
+++ b/libc/tools/check-symbols-glibc.py
@@ -79,6 +79,7 @@
   'fgetln',
   'fpurge',
   'funopen',
+  'funopen64',
   'gamma_r',
   'gammaf_r',
   'getprogname',