diff --git a/arch/arm/src/samv7/sam_mcan.c b/arch/arm/src/samv7/sam_mcan.c
index 4c56cc9d83..bdfcb22ae3 100755
--- a/arch/arm/src/samv7/sam_mcan.c
+++ b/arch/arm/src/samv7/sam_mcan.c
@@ -3443,7 +3443,7 @@ FAR struct can_dev_s *sam_mcan_initialize(int port)
    * use PCK5 to derive bit rate.
    */
 
-  regval = PMC_PCK_PRES(CONFIG_SAMV7_MCAN_CLKSRC_PRESCALER - 1) | SAMV7_MCAN_CLKSRC;
+  regval = PMC_PCK_PRES(CONFIG_SAMV7_MCAN_CLKSRC_PRESCALER) | SAMV7_MCAN_CLKSRC;
   putreg32(regval, SAM_PMC_PCK5);
 
   /* Enable PCK5 */