diff --git a/debug/gdbserver.py b/debug/gdbserver.py
index c8328a086..1280878d3 100755
--- a/debug/gdbserver.py
+++ b/debug/gdbserver.py
@@ -711,7 +711,7 @@ def test(self):
             self.gdb.p("$tdata1=0")
             tselect += 1
 
-        self.gdb.command(f"monitor riscv reserve_trigger {tselect}")
+        self.gdb.command(f"monitor riscv reserve_trigger {tselect} on")
 
         # The breakpoint should be hit exactly 2 times.
         for _ in range(2):