diff --git a/keyboards/keychron/q5_pro/rules.mk b/keyboards/keychron/q5_pro/rules.mk
index 6df2ef9e32..98cf5c564b 100755
--- a/keyboards/keychron/q5_pro/rules.mk
+++ b/keyboards/keychron/q5_pro/rules.mk
@@ -1,3 +1,5 @@
+# Enter lower-power sleep mode when on the ChibiOS idle thread
+OPT_DEFS += -DCORTEX_ENABLE_WFI_IDLE=TRUE
 OPT_DEFS += -DNO_USB_STARTUP_CHECK -DENABLE_FACTORY_TEST
 OPT_DEFS += -DKC_BLUETOOTH_ENABLE