diff --git a/src/drivers/mb12xx/module.mk b/src/drivers/mb12xx/module.mk
index 4e00ada025..d751e93e4d 100644
--- a/src/drivers/mb12xx/module.mk
+++ b/src/drivers/mb12xx/module.mk
@@ -38,3 +38,5 @@
 MODULE_COMMAND	= mb12xx
 
 SRCS		= mb12xx.cpp
+
+MAXOPTIMIZATION	 = -Os