diff --git a/liteeth/phy/usp_1000basex.py b/liteeth/phy/usp_1000basex.py
index 47c6d7a..904af2f 100644
--- a/liteeth/phy/usp_1000basex.py
+++ b/liteeth/phy/usp_1000basex.py
@@ -438,7 +438,7 @@ class USP_1000BASEX(Module, AutoCSR):
             p_RX_INT_DATAWIDTH             = 0,
             p_RX_PMA_POWER_SAVE            = 0b0,
             p_RX_PMA_RSV0                  = 0b0000000000101111,
-            p_RX_PROGDIV_CFG               = 0.0,
+            p_RX_PROGDIV_CFG               = 20.0,
             p_RX_PROGDIV_RATE              = 0b0000000000000001,
             p_RX_RESLOAD_CTRL              = 0b0000,
             p_RX_RESLOAD_OVRD              = 0b0,
@@ -550,7 +550,7 @@ class USP_1000BASEX(Module, AutoCSR):
             p_TX_PMA_RSV0                  = 0b0000000000000000,
             p_TX_PMA_RSV1                  = 0b0000000000000000,
             p_TX_PROGCLK_SEL               = "PREPI",
-            p_TX_PROGDIV_CFG               = 0.0,
+            p_TX_PROGDIV_CFG               = 20.0,
             p_TX_PROGDIV_RATE              = 0b0000000000000001,
             p_TX_RXDETECT_CFG              = 0b00000000110010,
             p_TX_RXDETECT_REF              = 5,