diff --git a/wally-pipelined/src/uncore/uartPC16550D.sv b/wally-pipelined/src/uncore/uartPC16550D.sv
index a98543cab..c3e5af1cf 100644
--- a/wally-pipelined/src/uncore/uartPC16550D.sv
+++ b/wally-pipelined/src/uncore/uartPC16550D.sv
@@ -377,6 +377,7 @@ module uartPC16550D(
           txhrfull <= #1 1;
         end
         $write("%c",Din); // for testbench
+        if (Din == '\n') $flush;
       end
       if (txstate == UART_IDLE) begin // move data into tx shift register if available
         if (fifoenabled) begin