diff --git a/pyocd/gdbserver/gdbserver.py b/pyocd/gdbserver/gdbserver.py
index 12098af9c..36af8f406 100644
--- a/pyocd/gdbserver/gdbserver.py
+++ b/pyocd/gdbserver/gdbserver.py
@@ -954,7 +954,7 @@ def handle_query(self, msg):
                 # Must return an empty packet for an unrecognized qXfer.
                 return self.create_rsp_packet(b"")
 
-        elif query[0].startswith(b'C'):
+        elif query[0] == b'C':
             if not self.is_threading_enabled():
                 return self.create_rsp_packet(b"QC1")
             else: