diff --git a/arch/x86_64/src/common/x86_64_initialize.c b/arch/x86_64/src/common/x86_64_initialize.c
index 5a960c617dc..aee4940146a 100644
--- a/arch/x86_64/src/common/x86_64_initialize.c
+++ b/arch/x86_64/src/common/x86_64_initialize.c
@@ -51,33 +51,6 @@ struct simple_addrenv_s g_addrenv =
  * Private Functions
  ****************************************************************************/
 
-/****************************************************************************
- * Name: up_calibratedelay
- *
- * Description:
- *   Delay loops are provided for short timing loops.  This function, if
- *   enabled, will just wait for 100 seconds.  Using a stopwatch, you can
- *   can then determine if the timing loops are properly calibrated.
- *
- ****************************************************************************/
-
-#if defined(CONFIG_ARCH_CALIBRATION) && defined(CONFIG_DEBUG_FEATURES)
-static void up_calibratedelay(void)
-{
-  int i;
-
-  _warn("Beginning 100s delay\n");
-  for (i = 0; i < 100; i++)
-    {
-      up_mdelay(1000);
-    }
-
-  _warn("End 100s delay\n");
-}
-#else
-#  define up_calibratedelay()
-#endif
-
 /****************************************************************************
  * Name: up_addrenv_init
  *