diff --git a/archinstall/lib/general.py b/archinstall/lib/general.py
index c1db6fb3..611378ee 100644
--- a/archinstall/lib/general.py
+++ b/archinstall/lib/general.py
@@ -217,6 +217,7 @@ class SysCommandWorker:
 
 		if self.child_fd:
 			return os.write(self.child_fd, data + (b'\n' if line_ending else b''))
+			os.fsync(self.child_fd)
 
 		return 0