diff --git a/src/cpu/386_common.c b/src/cpu/386_common.c
index aa5a813b8..bef9aa59a 100644
--- a/src/cpu/386_common.c
+++ b/src/cpu/386_common.c
@@ -1868,6 +1868,9 @@ cpu_fast_off_period_set(uint16_t val, double period)
 void
 cpu_fast_off_reset(void)
 {
+    if (cpu-fast_off_timer)
+	timer_disable(cpu_fast_off_timer);
+
     cpu_register_fast_off_handler(NULL);
     cpu_fast_off_period = 0.0;
     cpu_fast_off_advance();