diff --git a/plat/st/common/stm32mp_auth.c b/plat/st/common/stm32mp_auth.c
index 744201c..97fbffa 100644
--- a/plat/st/common/stm32mp_auth.c
+++ b/plat/st/common/stm32mp_auth.c
@@ -46,6 +46,11 @@
 		INFO("Check signature on Open device\n");
 	}
 
+	if (auth_ops == NULL) {
+		ERROR("Device doesn't support image authentication\n");
+		return -EOPNOTSUPP;
+	}
+
 	ret = mmap_add_dynamic_region(STM32MP_ROM_BASE, STM32MP_ROM_BASE,
 				      STM32MP_ROM_SIZE_2MB_ALIGNED, MT_CODE | MT_SECURE);
 	if (ret != 0) {