diff --git a/include/configs/stm32f429-discovery.h b/include/configs/stm32f429-discovery.h
index 17969952d1..8191fb2b8a 100644
--- a/include/configs/stm32f429-discovery.h
+++ b/include/configs/stm32f429-discovery.h
@@ -9,6 +9,7 @@
 #define __CONFIG_H
 
 #define CONFIG_STM32F4
+#define CONFIG_SYS_THUMB_BUILD
 #define CONFIG_STM32F4DISCOVERY
 
 #define CONFIG_OF_LIBFDT