diff --git a/ChangeLog b/ChangeLog
index 5000c2dc..501d7838 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-03-21  Nicolas François  <nicolas.francois@centraliens.net>
+
+	* lib/commonio.c: Call fsync before closing the backup file. This
+	ensures that the backup file is flushed to the storage medium.
+
 2009-03-15  Nicolas François  <nicolas.francois@centraliens.net>
 
 	* src/groupmod.c: Embed gshadow related cleanup in #ifdef
diff --git a/lib/commonio.c b/lib/commonio.c
index 0e9da37f..c80b9855 100644
--- a/lib/commonio.c
+++ b/lib/commonio.c
@@ -251,7 +251,8 @@ static int create_backup (const char *backup, FILE * fp)
 		fclose (bkfp);
 		return -1;
 	}
-	if (fclose (bkfp) != 0) {
+	if (   (fsync (fileno (bkfp)) != 0)
+	    || (fclose (bkfp) != 0)) {
 		return -1;
 	}