diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 6bb50baf22..0e91ff3f63 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2004-08-10  Mark Kettenis  <kettenis@gnu.org>
+
+	* procfs.c (procfs_pid_to_str): Use "%ld" to print LWP.
+
 2004-08-09  Joel Brobecker  <brobecker@gnat.com>
 
 	General cleanup of the AIX xm include file:
diff --git a/gdb/procfs.c b/gdb/procfs.c
index 19d7ae3904..b94e03710a 100644
--- a/gdb/procfs.c
+++ b/gdb/procfs.c
@@ -5132,7 +5132,7 @@ procfs_pid_to_str (ptid_t ptid)
   if (TIDGET (ptid) == 0)
     sprintf (buf, "process %d", PIDGET (ptid));
   else
-    sprintf (buf, "LWP %d", TIDGET (ptid));
+    sprintf (buf, "LWP %ld", TIDGET (ptid));
 
   return buf;
 }