diff --git a/Src/stm32l5xx_hal_fdcan.c b/Src/stm32l5xx_hal_fdcan.c
index 94f91bd..0b9319a 100644
--- a/Src/stm32l5xx_hal_fdcan.c
+++ b/Src/stm32l5xx_hal_fdcan.c
@@ -1302,7 +1302,7 @@
     if (sFilterConfig->IdType == FDCAN_STANDARD_ID)
     {
       /* Check function parameters */
-      assert_param(IS_FDCAN_MAX_VALUE(sFilterConfig->FilterIndex, (hfdcan->Init.StdFiltersNbr - 1U)));
+      assert_param(IS_FDCAN_MAX_VALUE((sFilterConfig->FilterIndex + 1U), hfdcan->Init.StdFiltersNbr));
       assert_param(IS_FDCAN_MAX_VALUE(sFilterConfig->FilterID1, 0x7FFU));
       assert_param(IS_FDCAN_MAX_VALUE(sFilterConfig->FilterID2, 0x7FFU));
       assert_param(IS_FDCAN_STD_FILTER_TYPE(sFilterConfig->FilterType));
@@ -1322,7 +1322,7 @@
     else /* sFilterConfig->IdType == FDCAN_EXTENDED_ID */
     {
       /* Check function parameters */
-      assert_param(IS_FDCAN_MAX_VALUE(sFilterConfig->FilterIndex, (hfdcan->Init.ExtFiltersNbr - 1U)));
+      assert_param(IS_FDCAN_MAX_VALUE((sFilterConfig->FilterIndex + 1U), hfdcan->Init.ExtFiltersNbr));
       assert_param(IS_FDCAN_MAX_VALUE(sFilterConfig->FilterID1, 0x1FFFFFFFU));
       assert_param(IS_FDCAN_MAX_VALUE(sFilterConfig->FilterID2, 0x1FFFFFFFU));
       assert_param(IS_FDCAN_EXT_FILTER_TYPE(sFilterConfig->FilterType));