diff --git a/firmware/command_ctrl.ino b/firmware/command_ctrl.ino
index deadb70..8720b29 100644
--- a/firmware/command_ctrl.ino
+++ b/firmware/command_ctrl.ino
@@ -323,16 +323,19 @@ void cc_enableClk(void)
   Serial.write(MSG_SOM2);
   if (cc_read_data[0] == SI5351_CLK0)
   {
+    si5351.set_freq((uint64_t)start_freq * 100, SI5351_PLL_FIXED, SI5351_CLK0);
     si5351.output_enable(SI5351_CLK0, 1); // enable clock output 0
     Serial.write(MSG_TYPE_ANSWER_OK);
   }
   else if (cc_read_data[0] == SI5351_CLK1)
   {
+    si5351.set_freq((uint64_t)start_freq * 100, SI5351_PLL_FIXED, SI5351_CLK1);
     si5351.output_enable(SI5351_CLK1, 1); // enable clock output 1
     Serial.write(MSG_TYPE_ANSWER_OK);
   }
   else if (cc_read_data[0] == SI5351_CLK2)
   {
+    si5351.set_freq((uint64_t)start_freq * 100, SI5351_PLL_FIXED, SI5351_CLK2);
     si5351.output_enable(SI5351_CLK2, 1); // enable clock output 2
     Serial.write(MSG_TYPE_ANSWER_OK);
   } else {