diff --git a/gdb/darwin-nat.c b/gdb/darwin-nat.c
index e1acc05..ebfa98e 100644
--- a/gdb/darwin-nat.c
+++ b/gdb/darwin-nat.c
@@ -254,8 +254,8 @@ darwin_ptrace (const char *name,
   if (ret == -1 && errno == 0)
     ret = 0;
 
-  inferior_debug (4, _("ptrace (%s, %d, 0x%x, %d): %d (%s)\n"),
-                  name, pid, arg3, arg4, ret,
+  inferior_debug (4, _("ptrace (%s, %d, 0x%lx, %d): %d (%s)\n"),
+                  name, pid, (unsigned long) arg3, arg4, ret,
                   (ret != 0) ? safe_strerror (errno) : _("no error"));
   return ret;
 }
@@ -835,7 +835,7 @@ darwin_resume (ptid_t ptid, int step, enum gdb_signal signal)
   struct inferior *inf;
 
   inferior_debug
-    (2, _("darwin_resume: pid=%d, tid=0x%x, step=%d, signal=%d\n"),
+    (2, _("darwin_resume: pid=%d, tid=0x%ld, step=%d, signal=%d\n"),
      ptid_get_pid (ptid), ptid_get_tid (ptid), step, signal);
 
   if (signal == GDB_SIGNAL_0)
@@ -1061,7 +1061,7 @@ cancel_breakpoint (ptid_t ptid)
   pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch);
   if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc))
     {
-      inferior_debug (4, "cancel_breakpoint for thread 0x%x\n",
+      inferior_debug (4, "cancel_breakpoint for thread 0x%ld\n",
 		      ptid_get_tid (ptid));
 
       /* Back up the PC if necessary.  */
@@ -2170,7 +2170,7 @@ _initialize_darwin_inferior (void)
 
   add_target (darwin_ops);
 
-  inferior_debug (2, _("GDB task: 0x%lx, pid: %d\n"), mach_task_self (),
+  inferior_debug (2, _("GDB task: 0x%lx, pid: %d\n"), (unsigned long) mach_task_self (),
                   getpid ());
 
   add_setshow_zuinteger_cmd ("darwin", class_obscure,