diff --git a/boards.txt b/boards.txt
index 2b213a8dfd9..d97b66fffee 100644
--- a/boards.txt
+++ b/boards.txt
@@ -4100,7 +4100,7 @@ ttgo-t-watch.serial.disableRTS=true
 ttgo-t-watch.build.mcu=esp32
 ttgo-t-watch.build.core=esp32
 ttgo-t-watch.build.variant=twatch
-ttgo-t-watch.build.board=T-Watch
+ttgo-t-watch.build.board=T_Watch
 
 ttgo-t-watch.build.f_cpu=240000000L
 ttgo-t-watch.build.flash_size=16MB