diff --git a/drivers/cpufreq/pmac64-cpufreq.c b/drivers/cpufreq/pmac64-cpufreq.c
index 889c0d5..db9764e 100644
--- a/drivers/cpufreq/pmac64-cpufreq.c
+++ b/drivers/cpufreq/pmac64-cpufreq.c
@@ -627,8 +627,10 @@
 	g5_cpu_freqs[0].frequency = max_freq;
 	g5_cpu_freqs[1].frequency = min_freq;
 
+	/* Based on a measurement on Xserve G5, rounded up. */
+	transition_latency = 10 * NSEC_PER_MSEC;
+
 	/* Set callbacks */
-	transition_latency = CPUFREQ_ETERNAL;
 	g5_switch_volt = g5_pfunc_switch_volt;
 	g5_switch_freq = g5_pfunc_switch_freq;
 	g5_query_freq = g5_pfunc_query_freq;