diff --git a/Makefile b/Makefile
index 0a6c2ae..d431d3b 100644
--- a/Makefile
+++ b/Makefile
@@ -30,8 +30,6 @@ clean:
 distclean: clean
 
 size: ponydos.asm
-	@$(NASM) -fbin -d SIZE -o ponydos_size.bin ponydos.asm
-	@wc -c ponydos_size.bin
-	@rm ponydos_size.bin
+	@$(NASM) -fbin -d SIZE -o /dev/stdout ponydos.asm | wc -c
 
 .PHONY: all run clean distclean size