diff --git a/src/common/http_connection.h b/src/common/http_connection.h
index c192e79b..06024b02 100644
--- a/src/common/http_connection.h
+++ b/src/common/http_connection.h
@@ -46,6 +46,7 @@ public:
     , uint16_t port
     )
     : mp_http_client(p_http_client)
+    , m_ok(false)
   {
     // TODO fix http client so that it accepts properly typed arguments
     std::string ip_str = epee::string_tools::get_ip_string_from_int32(ip);
@@ -61,7 +62,7 @@ public:
     }
   }
 
-  bool is_open()
+  bool is_open() const
   {
     return m_ok;
   }
diff --git a/src/common/rpc_client.h b/src/common/rpc_client.h
index dc9f32c2..2e460912 100644
--- a/src/common/rpc_client.h
+++ b/src/common/rpc_client.h
@@ -54,7 +54,7 @@ namespace tools
       , m_port{port}
     {}
 
-    std::string build_url(std::string const & relative_url)
+    std::string build_url(std::string const & relative_url) const
     {
       std::string result =
               "http://"