diff --git a/libbb/missing_syscalls.c b/libbb/missing_syscalls.c
index dd430e3e2..e3c1e924b 100644
--- a/libbb/missing_syscalls.c
+++ b/libbb/missing_syscalls.c
@@ -39,4 +39,9 @@ int pivot_root(const char *new_root, const char *put_old)
 {
 	return syscall(__NR_pivot_root, new_root, put_old);
 }
+
+int tcdrain(int fd)
+{
+	return ioctl(fd, TCSBRK, 1);
+}
 #endif