diff --git a/arm9/Makefile b/arm9/Makefile
index dbb9d74..3cc75e7 100644
--- a/arm9/Makefile
+++ b/arm9/Makefile
@@ -5,7 +5,7 @@ TARGET := $(shell basename $(CURDIR))
 SOURCE := source
 BUILD  := build
 
-SUBARCH := -D$(PROCESSOR) -mcpu=arm946e-s -mtune=arm946e-s -mfloat-abi=soft -mthumb
+SUBARCH := -D$(PROCESSOR) -mcpu=arm946e-s -mtune=arm946e-s -mfloat-abi=soft -mno-thumb-interwork -marm
 INCDIRS := source source/common source/filesys source/crypto source/fatfs source/nand source/virtual source/game source/gamecart source/lodepng source/qrcodegen source/system source/utils
 INCLUDE := $(foreach dir,$(INCDIRS),-I"$(shell pwd)/$(dir)")