diff --git a/target/linux/ramips/rt305x/target.mk b/target/linux/ramips/rt305x/target.mk
index e355060228e..b4516caa869 100644
--- a/target/linux/ramips/rt305x/target.mk
+++ b/target/linux/ramips/rt305x/target.mk
@@ -5,7 +5,7 @@
 SUBTARGET:=rt305x
 BOARDNAME:=RT305x based boards
 ARCH_PACKAGES:=ramips_24kec
-CFLAGS+= -march=24kec
+CFLAGS+= -march=24kec -mdsp
 
 define Target/Description
 	Build firmware images for Ralink RT305x based boards.
diff --git a/target/linux/ramips/rt3883/target.mk b/target/linux/ramips/rt3883/target.mk
index 85bfc5aa4e3..d66bf4cff63 100644
--- a/target/linux/ramips/rt3883/target.mk
+++ b/target/linux/ramips/rt3883/target.mk
@@ -5,7 +5,8 @@
 SUBTARGET:=rt3883
 BOARDNAME:=RT3662/RT3883 based boards
 ARCH_PACKAGES:=ramips_24kec
-CFLAGS+= -march=24kec
+ARCH_SUFFIX:=dspr2
+CFLAGS+= -march=24kec -mdspr2
 
 define Target/Description
 	Build firmware images for Ralink RT3662/RT3883 based boards.