diff --git a/plat/arm/board/fvp/include/platform_def.h b/plat/arm/board/fvp/include/platform_def.h
index a986017..50f6389 100644
--- a/plat/arm/board/fvp/include/platform_def.h
+++ b/plat/arm/board/fvp/include/platform_def.h
@@ -118,7 +118,11 @@
  * little space for growth.
  */
 #if TRUSTED_BOARD_BOOT
+#if COT_DESC_IN_DTB
+# define PLAT_ARM_MAX_BL2_SIZE	(UL(0x1E000) - FVP_BL2_ROMLIB_OPTIMIZATION)
+#else
 # define PLAT_ARM_MAX_BL2_SIZE	(UL(0x1D000) - FVP_BL2_ROMLIB_OPTIMIZATION)
+#endif
 #else
 # define PLAT_ARM_MAX_BL2_SIZE	(UL(0x13000) - FVP_BL2_ROMLIB_OPTIMIZATION)
 #endif