diff --git a/libc/libc.x86_64.map b/libc/libc.x86_64.map
index 9875eda..2c04e4d 100644
--- a/libc/libc.x86_64.map
+++ b/libc/libc.x86_64.map
@@ -1268,4 +1268,5 @@
     malloc_disable;
     malloc_enable;
     malloc_iterate;
+    mallopt;
 } LIBC_O;