diff --git a/libc/arch-arm/syscalls.mk b/libc/arch-arm/syscalls.mk
index 2d944ca..f1d8fb1 100644
--- a/libc/arch-arm/syscalls.mk
+++ b/libc/arch-arm/syscalls.mk
@@ -72,6 +72,7 @@
 syscall_src += arch-arm/syscalls/ftruncate.S
 syscall_src += arch-arm/syscalls/getdents.S
 syscall_src += arch-arm/syscalls/fsync.S
+syscall_src += arch-arm/syscalls/fdatasync.S
 syscall_src += arch-arm/syscalls/fchown.S
 syscall_src += arch-arm/syscalls/sync.S
 syscall_src += arch-arm/syscalls/__fcntl64.S