diff --git a/arch/arm/src/samv7/sam_clockconfig.c b/arch/arm/src/samv7/sam_clockconfig.c
index c7bd6bbc9ac..2538aadc75d 100644
--- a/arch/arm/src/samv7/sam_clockconfig.c
+++ b/arch/arm/src/samv7/sam_clockconfig.c
@@ -64,7 +64,7 @@
  * in board.h
  */
 
-#define BOARD_CKGR_MOR      (PMC_CKGR_MOR_MOSCXTEN | PMC_CKGR_MOR_MOSCRCEN | \
+#define BOARD_CKGR_MOR      (BOARD_CKGR_MOR_MOSCXTENBY | PMC_CKGR_MOR_MOSCRCEN | \
                              BOARD_CKGR_MOR_MOSCXTST | PMC_CKGR_MOR_KEY)
 #define BOARD_CKGR_PLLAR    (BOARD_CKGR_PLLAR_DIV | BOARD_CKGR_PLLAR_COUNT | \
                              BOARD_CKGR_PLLAR_MUL | PMC_CKGR_PLLAR_ONE)