diff --git a/APSCT_CLK_I2C.py b/APSCT_CLK_I2C.py
index 1465aa7f3f0f03d773174fb7496fdf19b0292ef1..99309c6c99b0140bf4499697e2c9cc513bf45d57 100644
--- a/APSCT_CLK_I2C.py
+++ b/APSCT_CLK_I2C.py
@@ -26,7 +26,7 @@ else:
 DEBUG = False
 I2CBUSNR=5
 sleep_time = 0.15
-SET_PLL = False #True
+SET_PLL = True
 READ_LOCK = True
 READ_ALL = False
 CHECK_EEPROM = False