diff --git a/keyboards/anne_pro/rules.mk b/keyboards/anne_pro/rules.mk
index d1c063c60d..b794f5223d 100644
--- a/keyboards/anne_pro/rules.mk
+++ b/keyboards/anne_pro/rules.mk
@@ -36,3 +36,6 @@ MOUSEKEY_ENABLE = no  # Mouse keys
 EXTRAKEY_ENABLE = yes # Audio control and System control
 NKRO_ENABLE = yes     # USB Nkey Rollover
 EEPROM_DRIVER = transient
+
+# Enter lower-power sleep mode when on the ChibiOS idle thread
+OPT_DEFS += -DCORTEX_ENABLE_WFI_IDLE=TRUE