diff --git a/keyboards/coseyfannitutti/mysterium/rules.mk b/keyboards/coseyfannitutti/mysterium/rules.mk
index 9c518e938..453aef8ab 100644
--- a/keyboards/coseyfannitutti/mysterium/rules.mk
+++ b/keyboards/coseyfannitutti/mysterium/rules.mk
@@ -37,3 +37,5 @@ BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
 AUDIO_ENABLE = no           # Audio output on port C6
 FAUXCLICKY_ENABLE = no      # Use buzzer to emulate clicky switches
 HD44780_ENABLE = no         # Enable support for HD44780 based LCDs
+
+LAYOUTS = tkl_ansi