diff --git a/cpu/stm32_common/stmclk.c b/cpu/stm32_common/stmclk.c
index 793c67167e..a7f5c03df9 100644
--- a/cpu/stm32_common/stmclk.c
+++ b/cpu/stm32_common/stmclk.c
@@ -225,6 +225,8 @@ void stmclk_init_sysclk(void)
     RCC->CFGR |= RCC_CFGR_PLLXTPRE; /* PREDIV == 2 */
 #elif CLOCK_PLL_PREDIV > 2
     RCC->CFGR2 = PLL_PREDIV;        /* PREDIV > 2 */
+#elif CLOCK_PLL_PREDIV == 0
+#error "CLOCK_PLL_PREDIV invalid"
 #endif
 #endif
     RCC->CR |= (RCC_CR_PLLON);