diff --git a/configs/ntosd-dm320/Make.defs b/configs/ntosd-dm320/Make.defs
index f0ef5c8458..8fbe74836b 100644
--- a/configs/ntosd-dm320/Make.defs
+++ b/configs/ntosd-dm320/Make.defs
@@ -42,7 +42,7 @@ else
 			  -fomit-frame-pointer
 endif
 
-ARCHCPUFLAGS		= -mapcs-32 -mcpu=arm7tdmi -msoft-float -fno-builtin
+ARCHCPUFLAGS		= -mapcs-32 -mtune=arm9tdmi -march=armv5te -msoft-float -fno-builtin
 ARCHPICFLAGS		= -fpic
 ARCHWARNINGS		= -Wall -Wstrict-prototypes -Wshadow
 ARCHDEFINES		=