diff --git a/firmware/masterchip/Makefile b/firmware/masterchip/Makefile
index 390b004..c01fecc 100644
--- a/firmware/masterchip/Makefile
+++ b/firmware/masterchip/Makefile
@@ -40,7 +40,7 @@ fuses:
 
 
 clean:
-	rm -f *.o *.hex *.obj *.i *.s *.d */*.i */*.s */*.o */*.d version.h
+	rm -f *.o *.hex *.bin *.obj *.i *.s *.d */*.i */*.s */*.o */*.d version.h
 
 # file targets:
 firmware.bin:	$(OBJECTS)
diff --git a/firmware/slavechip/Makefile b/firmware/slavechip/Makefile
index f3fa900..848d37d 100644
--- a/firmware/slavechip/Makefile
+++ b/firmware/slavechip/Makefile
@@ -39,7 +39,7 @@ fuses:
 
 
 clean:
-	rm -f *.o *.hex *.obj *.i *.s *.d */*.i */*.s */*.o */*.d version.h
+	rm -f *.o *.hex *.bin *.obj *.i *.s *.d */*.i */*.s */*.o */*.d version.h
 
 # file targets:
 firmware.bin:	$(OBJECTS)