diff --git a/Makefile b/Makefile
index 3dfd4b6..f9b9e88 100644
--- a/Makefile
+++ b/Makefile
@@ -74,10 +74,10 @@ program: $(PROGRAM).hex
 clean:
 	rm -rf *.o *.elf *.lst *.map *.sym *.lss *.eep *.srec *.bin *.hex *.al *.i *.s *~
 
-size: $(PROGRAM).hex
+size: $(PROGRAM).elf
 	@echo "  SIZE                   Atmega168        Atmega328p"
-	@objdump -h mendel.elf | perl -ne '/.(text)\s+([0-9a-f]+)/ && do { $$a += eval "0x$$2" }; END { printf "    FLASH: %5d bytes  (%2d%% of %2dkb)    (%2d%% of %2dkb)\n", $$a, $$a * 100 / (14 * 1024), 14, $$a * 100 / (30 * 1024), 30 }'
-	@objdump -h mendel.elf | perl -ne '/.(data|bss)\s+([0-9a-f]+)/ && do { $$a += eval "0x$$2" }; END { printf "    RAM  : %5d bytes  (%2d%% of %2dkb)    (%2d%% of %2dkb)\n", $$a, $$a * 100 / (1 * 1024), 1, $$a * 100 / (2 * 1024), 2 }'
+	@$(OBJDUMP) -h $^ | perl -ne '/.(text)\s+([0-9a-f]+)/ && do { $$a += eval "0x$$2" }; END { printf "    FLASH: %5d bytes  (%2d%% of %2dkb)    (%2d%% of %2dkb)\n", $$a, $$a * 100 / (14 * 1024), 14, $$a * 100 / (30 * 1024), 30 }'
+	@$(OBJDUMP) -h $^ | perl -ne '/.(data|bss)\s+([0-9a-f]+)/ && do { $$a += eval "0x$$2" }; END { printf "    RAM  : %5d bytes  (%2d%% of %2dkb)    (%2d%% of %2dkb)\n", $$a, $$a * 100 / (1 * 1024), 1, $$a * 100 / (2 * 1024), 2 }'
 
 %.o: %.c
 	@echo "  CC        $@"