diff --git a/boards.txt b/boards.txt
index 150715d0..a81ce94e 100644
--- a/boards.txt
+++ b/boards.txt
@@ -1218,7 +1218,7 @@ 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.board=M5Stack-Core-ESP32
+m5stack-core-esp32.build.board=M5Stack_Core_ESP32
 
 m5stack-core-esp32.build.f_cpu=240000000L
 m5stack-core-esp32.build.flash_size=4MB