diff --git a/target/mips/cpu.c b/target/mips/cpu.c
index 4aae23934b..0766e25693 100644
--- a/target/mips/cpu.c
+++ b/target/mips/cpu.c
@@ -440,8 +440,9 @@ static void mips_cp0_period_set(MIPSCPU *cpu)
 {
     CPUMIPSState *env = &cpu->env;
 
+    /* env->CCRes isn't initialised this early, use env->cpu_model->CCRes. */
     env->cp0_count_ns = clock_ticks_to_ns(MIPS_CPU(cpu)->clock,
-                                          cpu->cp0_count_rate);
+                                          env->cpu_model->CCRes);
     assert(env->cp0_count_ns);
 }