diff --git a/plat/st/common/stm32mp_auth.c b/plat/st/common/stm32mp_auth.c
index 0ef6d54..744201c 100644
--- a/plat/st/common/stm32mp_auth.c
+++ b/plat/st/common/stm32mp_auth.c
@@ -1,13 +1,11 @@
 /*
- * Copyright (c) 2019, STMicroelectronics - All Rights Reserved
+ * Copyright (c) 2019-2022, STMicroelectronics - All Rights Reserved
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
 #include <errno.h>
 
-#include <platform_def.h>
-
 #include <common/debug.h>
 #include <drivers/io/io_storage.h>
 #include <drivers/st/bsec.h>
@@ -15,6 +13,8 @@
 #include <lib/xlat_tables/xlat_tables_v2.h>
 #include <plat/common/platform.h>
 
+#include <platform_def.h>
+
 static const struct stm32mp_auth_ops *auth_ops;
 
 void stm32mp_init_auth(struct stm32mp_auth_ops *init_ptr)
@@ -47,7 +47,7 @@
 	}
 
 	ret = mmap_add_dynamic_region(STM32MP_ROM_BASE, STM32MP_ROM_BASE,
-				      STM32MP_ROM_SIZE, MT_CODE | MT_SECURE);
+				      STM32MP_ROM_SIZE_2MB_ALIGNED, MT_CODE | MT_SECURE);
 	if (ret != 0) {
 		return ret;
 	}
@@ -85,6 +85,6 @@
 	}
 
 err:
-	mmap_remove_dynamic_region(STM32MP_ROM_BASE, STM32MP_ROM_SIZE);
+	mmap_remove_dynamic_region(STM32MP_ROM_BASE, STM32MP_ROM_SIZE_2MB_ALIGNED);
 	return ret;
 }
diff --git a/plat/st/stm32mp1/stm32mp1_def.h b/plat/st/stm32mp1/stm32mp1_def.h
index 9527469..338cff3 100644
--- a/plat/st/stm32mp1/stm32mp1_def.h
+++ b/plat/st/stm32mp1/stm32mp1_def.h
@@ -68,6 +68,7 @@
  ******************************************************************************/
 #define STM32MP_ROM_BASE		U(0x00000000)
 #define STM32MP_ROM_SIZE		U(0x00020000)
+#define STM32MP_ROM_SIZE_2MB_ALIGNED	U(0x00200000)
 
 #define STM32MP_SYSRAM_BASE		U(0x2FFC0000)
 #define STM32MP_SYSRAM_SIZE		U(0x00040000)