diff --git a/configs/same70-xplained/include/board.h b/configs/same70-xplained/include/board.h
index a8577f84e7d..41f4e365b18 100644
--- a/configs/same70-xplained/include/board.h
+++ b/configs/same70-xplained/include/board.h
@@ -57,9 +57,11 @@
  *   Master Clock (MCK): Source = PLLACK, Prescalar = 1 to generate MCK = 120MHz
  *   CPU clock: 120MHz
  *
- * There are two on-board crystals:
+ * There can be two on-board crystals.  However, the the 32.768 crystal is not
+ * populated on the stock SAME70.
  */
 
+#undef  BOARD_HAVE_SLOWXTAL                   /* Slow crystal not populated */
 #define BOARD_SLOWCLK_FREQUENCY    (32768)    /* 32.768 KHz slow crystal oscillator */
 #define BOARD_MAINOSC_FREQUENCY    (12000000) /* 12 MHz main oscillator */
 
diff --git a/configs/samv71-xult/include/board.h b/configs/samv71-xult/include/board.h
index 6a7448f79cb..97a0195cc47 100644
--- a/configs/samv71-xult/include/board.h
+++ b/configs/samv71-xult/include/board.h
@@ -60,6 +60,7 @@
  * There are two on-board crystals:
  */
 
+#define BOARD_HAVE_SLOWXTAL        1          /* Slow crystal is populated */
 #define BOARD_SLOWCLK_FREQUENCY    (32768)    /* 32.768 KHz slow crystal oscillator */
 #define BOARD_MAINOSC_FREQUENCY    (12000000) /* 12 MHz main oscillator */