diff --git a/libc/kernel/arch-x86/asm/unistd_32.h b/libc/kernel/arch-x86/asm/unistd_32.h
index b8ade84..4536585 100644
--- a/libc/kernel/arch-x86/asm/unistd_32.h
+++ b/libc/kernel/arch-x86/asm/unistd_32.h
@@ -421,4 +421,5 @@
 #define __NR_eventfd 323
 #define __NR_fallocate 324
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define __NR_perf_event_open 364
 #endif