diff --git a/src/add-ons/kernel/drivers/power/enhanced_speedstep/frequency.cpp b/src/add-ons/kernel/drivers/power/enhanced_speedstep/frequency.cpp
index 63d45f8ce5..c1918632df 100644
--- a/src/add-ons/kernel/drivers/power/enhanced_speedstep/frequency.cpp
+++ b/src/add-ons/kernel/drivers/power/enhanced_speedstep/frequency.cpp
@@ -120,6 +120,7 @@ bus_speed_ok(int bus)
 	switch (bus) {
 		case 100:
 		case 133:
+		case 166:
 		case 333:
 			return true;
 		default: