diff --git a/plat/st/stm32mp1/stm32mp1_def.h b/plat/st/stm32mp1/stm32mp1_def.h
index 6fde3b5ba..31f80d9a6 100644
--- a/plat/st/stm32mp1/stm32mp1_def.h
+++ b/plat/st/stm32mp1/stm32mp1_def.h
@@ -626,5 +626,6 @@ static inline uintptr_t tamp_bkpr(uint32_t idx)
 #define DT_RCC_CLK_COMPAT		"st,stm32mp1-rcc"
 #define DT_RCC_SEC_CLK_COMPAT		"st,stm32mp1-rcc-secure"
 #endif
+#define DT_SDMMC2_COMPAT		"st,stm32-sdmmc2"
 
 #endif /* STM32MP1_DEF_H */