diff --git a/tests/sys/kern/sonewconn_overflow.py b/tests/sys/kern/sonewconn_overflow.py
index c7eb983fb98..d94ebc63482 100644
--- a/tests/sys/kern/sonewconn_overflow.py
+++ b/tests/sys/kern/sonewconn_overflow.py
@@ -85,6 +85,8 @@ def __del__(self):
 
 class LogChecker():
     def __init__(self):
+        # Clear the dmesg buffer to prevent rotating causes issues
+        os.system('/sbin/dmesg -c > /dev/null')
         # Figure out how big the dmesg buffer is.
         self.dmesgOff = len(check_output("/sbin/dmesg"))