diff --git a/plat/renesas/common/include/platform_def.h b/plat/renesas/common/include/platform_def.h
index 1213a3c..ab071ec 100644
--- a/plat/renesas/common/include/platform_def.h
+++ b/plat/renesas/common/include/platform_def.h
@@ -40,7 +40,7 @@
 #define PLATFORM_STACK_SIZE	U(0x400)
 #endif
 #elif IMAGE_BL31
-#define PLATFORM_STACK_SIZE	U(0x400)
+#define PLATFORM_STACK_SIZE	U(0x800)
 #elif IMAGE_BL32
 #define PLATFORM_STACK_SIZE	U(0x440)
 #endif