diff --git a/arch/z16/src/common/up_initialize.c b/arch/z16/src/common/up_initialize.c
index 0a6a220f81e..c7413e89ad1 100644
--- a/arch/z16/src/common/up_initialize.c
+++ b/arch/z16/src/common/up_initialize.c
@@ -93,7 +93,7 @@ FAR chipreg_t *current_regs;
  *
  ****************************************************************************/
 
-#if defined(CONFIG_ARCH_CALIBRATION) & defined(CONFIG_DEBUG) && defined(CONFIG_ARCH_LOWPUTC)
+#if defined(CONFIG_ARCH_CALIBRATION) && defined(CONFIG_DEBUG) && defined(CONFIG_ARCH_LOWPUTC)
 static void up_calibratedelay(void)
 {
   int i;