diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 6ad0ed256..e9c2e1455 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,9 @@
+2014-02-10  Corinna Vinschen  <corinna@vinschen.de>
+
+	* cygheap.cc (cwcsdup): Change parameter to correct PWCSTR.
+	(cwcsdup1): Ditto.
+	* cygheap_malloc.h: Change declarations accordingly.
+
 2014-02-10  Corinna Vinschen  <corinna@vinschen.de>
 
 	* uinfo.cc (pwdgrp::fetch_account_from_windows): Add code to allow
diff --git a/winsup/cygwin/cygheap.cc b/winsup/cygwin/cygheap.cc
index ea6eaa1a9..1ccbbaf5f 100644
--- a/winsup/cygwin/cygheap.cc
+++ b/winsup/cygwin/cygheap.cc
@@ -1,7 +1,7 @@
 /* cygheap.cc: Cygwin heap manager.
 
    Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
-   2011, 2012, 2013 Red Hat, Inc.
+   2011, 2012, 2013, 2014 Red Hat, Inc.
 
    This file is part of Cygwin.
 
@@ -478,7 +478,7 @@ ccalloc_abort (cygheap_types x, size_t n, size_t size)
 }
 
 extern "C" PWCHAR __reg1
-cwcsdup (const PWCHAR s)
+cwcsdup (PCWSTR s)
 {
   MALLOC_CHECK;
   PWCHAR p = (PWCHAR) cmalloc (HEAP_STR, (wcslen (s) + 1) * sizeof (WCHAR));
@@ -490,7 +490,7 @@ cwcsdup (const PWCHAR s)
 }
 
 extern "C" PWCHAR __reg1
-cwcsdup1 (const PWCHAR s)
+cwcsdup1 (PCWSTR s)
 {
   MALLOC_CHECK;
   PWCHAR p = (PWCHAR) cmalloc (HEAP_1_STR, (wcslen (s) + 1) * sizeof (WCHAR));
diff --git a/winsup/cygwin/cygheap_malloc.h b/winsup/cygwin/cygheap_malloc.h
index a4ab2462e..088243ee3 100644
--- a/winsup/cygwin/cygheap_malloc.h
+++ b/winsup/cygwin/cygheap_malloc.h
@@ -1,7 +1,7 @@
 /* cygheap_malloc.h: Cygwin heap manager allocation functions.
 
-   Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2011
-   Red Hat, Inc.
+   Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2011,
+   2014 Red Hat, Inc.
 
 This file is part of Cygwin.
 
@@ -48,8 +48,8 @@ void *__reg3 ccalloc (cygheap_types, size_t, size_t);
 void *__reg2 cmalloc_abort (cygheap_types, size_t);
 void *__reg2 crealloc_abort (void *, size_t);
 void *__reg3 ccalloc_abort (cygheap_types, size_t, size_t);
-PWCHAR __reg1 cwcsdup (const PWCHAR);
-PWCHAR __reg1 cwcsdup1 (const PWCHAR);
+PWCHAR __reg1 cwcsdup (PCWSTR);
+PWCHAR __reg1 cwcsdup1 (PCWSTR);
 char *__reg1 cstrdup (const char *);
 char *__reg1 cstrdup1 (const char *);
 void __reg2 cfree_and_set (char *&, char * = NULL);