diff --git a/Makefile b/Makefile
index ea070fc..63e7a66 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,7 @@ FQBN	:= esp32:esp32:esp32
 NAME	:= esp32-env-monitor
 SOURCE 	:= $(addsuffix .ino, $(NAME)) wifi_login.h
 TARGET	:= $(addsuffix .$(subst :,.,$(FQBN)).bin, $(NAME))
+ELF	:= $(addsuffix .$(subst :,.,$(FQBN)).elf, $(NAME))
 ESPTOOL	:= ~/.arduino15/packages/esp32/tools/esptool_py/2.6.1/esptool.py
 PORT	:= /dev/ttyUSB0
 ADDRESS	:= 0x10000
@@ -11,7 +12,7 @@ ADDRESS	:= 0x10000
 compile: $(TARGET)
 
 clean:
-	rm -f $(TARGET)
+	rm -f $(TARGET) $(ELF)
 
 upload: $(TARGET)
 	$(ESPTOOL) --port $(PORT) write_flash $(ADDRESS) $(TARGET)