diff --git a/platform/cooja/Makefile.cooja b/platform/cooja/Makefile.cooja
index 89d596e7d..d4e80f182 100644
--- a/platform/cooja/Makefile.cooja
+++ b/platform/cooja/Makefile.cooja
@@ -117,7 +117,7 @@ $(CONTIKI_APP).cooja: $(JNILIB)
 	cp $(JNILIB) $@
 	rm $(CONTIKI_APP_OBJ)
 
-%.o: contiki-cooja-main.o
+mtype%.o: contiki-cooja-main.o
 	mv contiki-cooja-main.o $@
 
 symbols.c: