diff --git a/debug/gdbserver.py b/debug/gdbserver.py
index 3a6f93218..4b2291c1d 100755
--- a/debug/gdbserver.py
+++ b/debug/gdbserver.py
@@ -221,14 +221,15 @@ def test(self):
 
 class SimpleNoExistTest(GdbTest):
     def test(self):
+        nonexist_csr = self.hart.nonexist_csr
         try:
-            self.gdb.p("$csr2288")
-            assert False, "Reading csr2288 should have failed"
+            self.gdb.p(f"${nonexist_csr}")
+            assert False, f"Reading the ${nonexist_csr} should have failed"
         except testlib.CouldNotFetch:
             pass
         try:
-            self.gdb.p("$csr2288=5")
-            assert False, "Writing csr2288 should have failed"
+            self.gdb.p(f"${nonexist_csr}=5")
+            assert False, f"Writing the ${nonexist_csr} should have failed"
         except testlib.CouldNotFetch:
             pass
 
diff --git a/debug/targets.py b/debug/targets.py
index 3f63e79b9..c1633e9ae 100644
--- a/debug/targets.py
+++ b/debug/targets.py
@@ -33,6 +33,9 @@ class Hart:
     # no device mapped to that location.
     bad_address = None
 
+    # The non-existent register for access test
+    nonexist_csr = "csr2288"
+
     # Number of instruction triggers the hart supports.
     instruction_hardware_breakpoint_count = 0