diff --git a/arch/microblaze/Kconfig.platform b/arch/microblaze/Kconfig.platform
index 1b3d8c849101..6996f397c16c 100644
--- a/arch/microblaze/Kconfig.platform
+++ b/arch/microblaze/Kconfig.platform
@@ -8,6 +8,7 @@ menu "Platform options"
 
 config OPT_LIB_FUNCTION
 	bool "Optimalized lib function"
+	depends on CPU_LITTLE_ENDIAN
 	default y
 	help
 	  Allows turn on optimalized library function (memcpy and memmove).