diff --git a/src/ngx_http_lua_directive.c b/src/ngx_http_lua_directive.c
index 158642a5d0..784835fe13 100644
--- a/src/ngx_http_lua_directive.c
+++ b/src/ngx_http_lua_directive.c
@@ -1976,6 +1976,12 @@ ngx_http_lua_conf_read_lua_token(ngx_conf_t *cf,
             b->last = b->pos + n;
             start = b->start;
 
+#if (nginx_version >= 1009002)
+            if (dump) {
+                dump->last = ngx_cpymem(dump->last, b->start + len, size);
+            }
+#endif
+
             continue;
         }
 
diff --git a/t/192-lua-block-conf-dump.t b/t/192-lua-block-conf-dump.t
new file mode 100644
index 0000000000..81cae7deb1
--- /dev/null
+++ b/t/192-lua-block-conf-dump.t
@@ -0,0 +1,123 @@
+# vim:set ft= ts=4 sw=4 et fdm=marker:
+# Tests for nginx -T (conf dump) completeness with large lua_block directives
+# Regression test for https://github.com/openresty/lua-nginx-module/issues/2469
+
+use Test::Nginx::Socket::Lua;
+
+repeat_each(1);
+
+plan tests => repeat_each() * (blocks() * 3);
+
+$ENV{TEST_NGINX_HTML_DIR} ||= html_dir();
+
+my $html_dir = $ENV{TEST_NGINX_HTML_DIR};
+my $http_config = <<_EOC_;
+    init_by_lua_block {
+        function set_up_ngx_tmp_conf(conf)
+            assert(os.execute("mkdir -p $html_dir/logs"))
+
+            local conf_file = "$html_dir/nginx.conf"
+            local f, err = io.open(conf_file, "w")
+            if not f then
+                ngx.log(ngx.ERR, err)
+                return
+            end
+
+            assert(f:write(conf))
+            f:close()
+
+            return conf_file
+        end
+
+        function get_ngx_bin_path()
+            local ffi = require "ffi"
+            ffi.cdef[[char **ngx_argv;]]
+            return ffi.string(ffi.C.ngx_argv[0])
+        end
+    }
+_EOC_
+
+add_block_preprocessor(sub {
+    my $block = shift;
+
+    if (!defined $block->http_config) {
+        $block->set_value("http_config", $http_config);
+    }
+
+    if (!defined $block->request) {
+        $block->set_value("request", "GET /t");
+    }
+});
+
+env_to_nginx("PATH");
+log_level("warn");
+no_long_string();
+run_tests();
+
+__DATA__
+
+=== TEST 1: nginx -T shows complete content of large content_by_lua_block (issue #2469)
+--- config
+    location = /t {
+        content_by_lua_block {
+            -- Build a large lua block that forces a second buffer refill during
+            -- config parsing. The nginx config buffer is 4096 bytes, so we need
+            -- content that spans past that boundary in the config file.
+            local big_comment = string.rep("x", 4096)
+            local conf = string.format([[
+                pid logs/nginx_dump_test.pid;
+                events {
+                    worker_connections 64;
+                }
+                http {
+                    server {
+                        listen 18989;
+                        location = /t {
+                            content_by_lua_block {
+                                -- %s
+                                -- lua_block_conf_dump_marker_end
+                                ngx.say("ok")
+                            }
+                        }
+                    }
+                }
+            ]], big_comment)
+
+            local conf_file = set_up_ngx_tmp_conf(conf)
+            if not conf_file then
+                ngx.say("FAIL: could not create conf file")
+                return
+            end
+
+            local nginx = get_ngx_bin_path()
+
+            -- First verify the config is valid
+            local cmd = nginx .. " -p $TEST_NGINX_HTML_DIR -c " .. conf_file .. " -t 2>&1"
+            local p = io.popen(cmd)
+            local out = p:read("*a")
+            p:close()
+
+            if not out:find("test is successful") then
+                ngx.say("FAIL: config test failed: " .. out)
+                return
+            end
+
+            -- Now run nginx -T and check dump contains the full lua block
+            cmd = nginx .. " -p $TEST_NGINX_HTML_DIR -c " .. conf_file .. " -T 2>&1"
+            p = io.popen(cmd)
+            out = p:read("*a")
+            p:close()
+
+            if out:find("lua_block_conf_dump_marker_end") then
+                ngx.say("OK")
+            else
+                ngx.say("FAIL: marker not found in nginx -T output (truncated dump)")
+            end
+        }
+    }
+--- request
+GET /t
+--- response_body
+OK
+--- no_error_log
+[error]