diff --git a/debian/changelog b/debian/changelog
index 8ae37aad..665d65cc 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -53,6 +53,9 @@ shadow (1:4.1.3-1) unstable; urgency=low
   * debian/patches/507_32char_grnames.dpatch: Patch removed. Replaced by the
     --with-group-name-max-length=32 configure option.
   * debian/patches/592_manpages_typos: No more needed.
+  * debian/patches/401_cppw_src.dpatch: Call fsync before closing the backup
+    file descriptor. This ensures that the backup file will be available on
+    the storage medium.
 
  -- Nicolas FRANCOIS (Nekral) <nicolas.francois@centraliens.net>  Sat, 14 Mar 2009 18:44:29 +0100
 
diff --git a/debian/patches/401_cppw_src.dpatch b/debian/patches/401_cppw_src.dpatch
index 9c2caec2..87093c0e 100755
--- a/debian/patches/401_cppw_src.dpatch
+++ b/debian/patches/401_cppw_src.dpatch
@@ -9,7 +9,7 @@ Index: shadow-4.1.0/src/cppw.c
 ===================================================================
 --- /dev/null
 +++ shadow-4.1.0/src/cppw.c
-@@ -0,0 +1,198 @@
+@@ -0,0 +1,199 @@
 +/*
 +  cppw, cpgr  copy with locking given file over the password or group file
 +  with -s will copy with locking given file over shadow or gshadow file
@@ -86,7 +86,8 @@ Index: shadow-4.1.0/src/cppw.c
 +    unlink(backup);
 +    return -1;
 +  }
-+  if (fclose(bkfp)) {
++  if (   (fsync (bkfp) != 0)
++      || (fclose(bkfp) != 0)) {
 +    unlink(backup);
 +    return -1;
 +  }