diff --git a/arch/arm/src/stm32h7/Make.defs b/arch/arm/src/stm32h7/Make.defs
index abcb35307f0..5120ab178b8 100644
--- a/arch/arm/src/stm32h7/Make.defs
+++ b/arch/arm/src/stm32h7/Make.defs
@@ -99,7 +99,7 @@ ifeq ($(CONFIG_STM32_FMC),y)
 CHIP_CSRCS += stm32_fmc.c
 endif
 
-ifeq ($(filter y,$(CONFIG_STM32_IWDG) $(CONFIG_STM32_RTC_LSICLOCK)),y)
+ifneq ($(filter y,$(CONFIG_STM32_IWDG) $(CONFIG_STM32_RTC_LSICLOCK)),)
 CHIP_CSRCS += stm32_lsi.c
 endif