diff --git a/include/configs/x600.h b/include/configs/x600.h
index f672485d69da9c122f02f8284a2eb42e0246b2a2..73ba67c3e910d977f4e2ff252ccca2b1b2b39810 100644
--- a/include/configs/x600.h
+++ b/include/configs/x600.h
@@ -17,6 +17,7 @@
 #define CONFIG_SPEAR600				/* SPEAr600 SoC */
 #define CONFIG_X600				/* on X600 board */
 #define CONFIG_SYS_GENERIC_BOARD
+#define CONFIG_SYS_THUMB_BUILD
 
 #include <asm/arch/hardware.h>