error on rcc.c

SRC\stm32f4xx_rcc.c(2493): error:  #20: identifier "RCC_BDCR_LSEMOD" is undefined
      SET_BIT(RCC->BDCR, RCC_BDCR_LSEMOD);
SRC\stm32f4xx_rcc.c(2497): error:  #20: identifier "RCC_BDCR_LSEMOD" is undefined
      CLEAR_BIT(RCC->BDCR, RCC_BDCR_LSEMOD);
SRC\stm32f4xx_rcc.c: 0 warnings, 2 errors