diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 51a7bb5fd..cd103f7e9 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,9 @@
+2010-12-29  Christopher Faylor  <me+cygwin@cgf.cx>
+
+	* cygtls.cc: Include stdlib.h.
+	(_cygtls::init_thread): Seed random number generator on a per-thread
+	basis.
+
 2010-12-27  Christopher Faylor  <me+cygwin@cgf.cx>
 
 	* include/cygwin/version.h: Bump CYGWIN_VERSION_API_MINOR to 234.
diff --git a/winsup/cygwin/cygtls.cc b/winsup/cygwin/cygtls.cc
index c59f0cbd0..730c14182 100644
--- a/winsup/cygwin/cygtls.cc
+++ b/winsup/cygwin/cygtls.cc
@@ -10,6 +10,7 @@ details. */
 #define USE_SYS_TYPES_FD_SET
 #include "cygtls.h"
 #include <syslog.h>
+#include <stdlib.h>
 #include "path.h"
 #include "fhandler.h"
 #include "dtable.h"
@@ -93,6 +94,7 @@ _cygtls::init_thread (void *x, DWORD (*func) (void *, void *))
 	}
       local_clib._current_locale = "C";
       locals.process_logmask = LOG_UPTO (LOG_DEBUG);
+      srand48 ((long int) &x);
     }
 
   thread_id = GetCurrentThreadId ();