diff --git a/libc/libc.x86_64.map b/libc/libc.x86_64.map
index d464a0c..f511707 100644
--- a/libc/libc.x86_64.map
+++ b/libc/libc.x86_64.map
@@ -1292,6 +1292,8 @@
     posix_spawnp;
     pthread_attr_getinheritsched;
     pthread_attr_setinheritsched;
+    pthread_mutexattr_getprotocol;
+    pthread_mutexattr_setprotocol;
     pthread_setschedprio;
     sethostent;
     setnetent;