diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index f97f3ffe1..e358f7003 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+2007-12-11  Dave Korn  <dave.korn@artimi.com>
+
+	* cygheap.cc (_csbrk):  Don't request zero bytes from VirtualAlloc,
+	as windows treats that as an invalid parameter and returns an error.
+
 2007-12-11  Corinna Vinschen  <corinna@vinschen.de>
 
 	* localtime.cc (tzset): Call tzsetwall only if it hasn't been
diff --git a/winsup/cygwin/cygheap.cc b/winsup/cygwin/cygheap.cc
index b9f24eecc..23e193bc3 100644
--- a/winsup/cygwin/cygheap.cc
+++ b/winsup/cygwin/cygheap.cc
@@ -129,7 +129,7 @@ _csbrk (int sbs)
 	newbase = _cygheap_end;
 
       DWORD adjsbs = allocsize ((char *) cygheap_max - newbase);
-      if (!VirtualAlloc (newbase, adjsbs, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE))
+      if (adjsbs && !VirtualAlloc (newbase, adjsbs, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE))
 	{
 	  MEMORY_BASIC_INFORMATION m;
 	  if (!VirtualQuery (newbase, &m, sizeof m))