diff --git a/boards.txt b/boards.txt
index a81ce94e..1f13264b 100644
--- a/boards.txt
+++ b/boards.txt
@@ -1217,7 +1217,7 @@ m5stack-core-esp32.serial.disableRTS=true
 
 m5stack-core-esp32.build.mcu=esp32
 m5stack-core-esp32.build.core=esp32
-m5stack-core-esp32.build.variant=esp32
+m5stack-core-esp32.build.variant=m5stack_core_esp32
 m5stack-core-esp32.build.board=M5Stack_Core_ESP32
 
 m5stack-core-esp32.build.f_cpu=240000000L
diff --git a/variants/m5stack-core-esp32/pins_arduino.h b/variants/m5stack_core_esp32/pins_arduino.h
similarity index 100%
rename from variants/m5stack-core-esp32/pins_arduino.h
rename to variants/m5stack_core_esp32/pins_arduino.h