diff --git a/cpu/mc1322x/Makefile.mc1322x b/cpu/mc1322x/Makefile.mc1322x
index dd9d48162..389185b05 100644
--- a/cpu/mc1322x/Makefile.mc1322x
+++ b/cpu/mc1322x/Makefile.mc1322x
@@ -58,7 +58,7 @@ CFLAGSNO = -I. -I$(CONTIKI)/core -I$(CONTIKI_CPU) -I$(CONTIKI_CPU)/loader \
            -DWITH_ASCII -DMCK=$(MCK) \
            -Werror $(ARCH_FLAGS) -g 
 
-CFLAGS  += $(CFLAGSNO) -Os -DRUN_AS_SYSTEM -DROM_RUN -fno-strict-aliasing  -fno-common -ffixed-r8 -msoft-float -DTEXT_BASE=$(TEXT_BASE) -fno-builtin-printf -fno-builtin-sprintf
+CFLAGS  += $(CFLAGSNO) -Os -DRUN_AS_SYSTEM -DROM_RUN -fno-strict-aliasing  -fno-common -ffixed-r8 -msoft-float -DTEXT_BASE=$(TEXT_BASE) -fno-builtin-printf -fno-builtin-sprintf -MMD
 LDFLAGS += -T $(LINKERSCRIPT) -nostartfiles -static -u_start -Wl,-Map=contiki-$(TARGET).map,-export-dynamic
 AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS) -gstabs