diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index e2cf0dbab..adc9b1f43 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+2013-04-03  Corinna Vinschen  <corinna@vinschen.de>
+
+	* fhandler_proc.cc (format_proc_loadavg): Raise too small buffer size
+	to avoid overwriting unrelated cygheap memory.
+
 2013-04-03  Corinna Vinschen  <corinna@vinschen.de>
 
 	* path.cc (class suffix_scan): Add member namelen.
diff --git a/winsup/cygwin/fhandler_proc.cc b/winsup/cygwin/fhandler_proc.cc
index afd206365..57a1532a2 100644
--- a/winsup/cygwin/fhandler_proc.cc
+++ b/winsup/cygwin/fhandler_proc.cc
@@ -426,7 +426,7 @@ format_proc_loadavg (void *, char *&destbuf)
 	break;
     }
 
-  destbuf = (char *) crealloc_abort (destbuf, 16);
+  destbuf = (char *) crealloc_abort (destbuf, 48);
   return __small_sprintf (destbuf, "%u.%02u %u.%02u %u.%02u %u/%u\n",
 				    0, 0, 0, 0, 0, 0, running, pids.npids);
 }