diff --git a/Flow/demo/jtag.s b/Flow/demo/jtag.s
index a92aaf3..50b49f1 100644
--- a/Flow/demo/jtag.s
+++ b/Flow/demo/jtag.s
@@ -63,7 +63,6 @@ loop2:
    bnez x5, loop2
 
 loop3:
-   addi x4, x4, 1
    beq x0, x0, loop3
 
 // Write 0xff to STDOUT for TB to terminate test.