1 files changed, 2 insertions, 2 deletions
diff --git a/gr-blocks/lib/ctrlport_probe_c_impl.h b/gr-blocks/lib/ctrlport_probe_c_impl.h
index a9bccd0fe9..7e961487c0 100644
--- a/gr-blocks/lib/ctrlport_probe_c_impl.h
+++ b/gr-blocks/lib/ctrlport_probe_c_impl.h
@@ -23,8 +23,8 @@ class ctrlport_probe_c_impl : public ctrlport_probe_c
 private:
     boost::shared_mutex ptrlock;
 
-    std::string d_id;
-    std::string d_desc;
+    const std::string d_id;
+    const std::string d_desc;
     const gr_complex* d_ptr;
     size_t d_ptrLen;