diff --git a/src/gateware/cxp_downconn.py b/src/gateware/cxp_downconn.py
index bdd12e7..45718bb 100644
--- a/src/gateware/cxp_downconn.py
+++ b/src/gateware/cxp_downconn.py
@@ -370,7 +370,7 @@ class QPLL(Module):
 # Warning: Xilinx transceivers are LSB first, and comma needs to be flipped
 # compared to the usual 8b10b binary representation.
 class Comma_Detector(Module):
-    def __init__(self, comma, check_period=100_000):
+    def __init__(self, comma, check_period=150_000):
         self.data = Signal(20)
         self.rxinit_done = Signal()