diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index fc0508e327..f8b9386922 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2013-06-11  Joel Brobecker  <brobecker@adacore.com>
+
+	* windows-nat.c (thread_rec): Revert format used to print
+	error code returned by SuspendThread from %d back to %u.
+
 2013-06-11  Joel Brobecker  <brobecker@adacore.com>
 
 	* windows-nat.c (windows_continue): Add "0x" prefix for thread
diff --git a/gdb/windows-nat.c b/gdb/windows-nat.c
index e0bb7194e5..b30f4251ee 100644
--- a/gdb/windows-nat.c
+++ b/gdb/windows-nat.c
@@ -312,7 +312,7 @@ thread_rec (DWORD id, int get_context)
 		  {
 		    DWORD err = GetLastError ();
 		    warning (_("SuspendThread (tid=0x%x) failed."
-			       " (winerr %d)"),
+			       " (winerr %u)"),
 			     (unsigned) id, (unsigned) err);
 		    return NULL;
 		  }