diff --git a/libc/arch-x86/syscalls.mk b/libc/arch-x86/syscalls.mk
index 27153f9..f0d7a31 100644
--- a/libc/arch-x86/syscalls.mk
+++ b/libc/arch-x86/syscalls.mk
@@ -75,6 +75,7 @@
 syscall_src += arch-x86/syscalls/ftruncate.S
 syscall_src += arch-x86/syscalls/getdents.S
 syscall_src += arch-x86/syscalls/fsync.S
+syscall_src += arch-x86/syscalls/fdatasync.S
 syscall_src += arch-x86/syscalls/fchown.S
 syscall_src += arch-x86/syscalls/sync.S
 syscall_src += arch-x86/syscalls/__fcntl64.S