diff --git a/.github/workflows/CI-unixish.yml b/.github/workflows/CI-unixish.yml
index ed7319052..e941de7e0 100644
--- a/.github/workflows/CI-unixish.yml
+++ b/.github/workflows/CI-unixish.yml
@@ -408,6 +408,12 @@ jobs:
         run: |
           ./cppcheck --addon=misra addons/test/misra/crash1.c | ( ! grep 'Bailing out from checking' )
 
+      - name: Build democlient
+        if: matrix.os == 'ubuntu-22.04'
+        run: |
+          warnings="-pedantic -Wall -Wextra -Wcast-qual -Wno-deprecated-declarations -Wfloat-equal -Wmissing-declarations -Wmissing-format-attribute -Wno-long-long -Wpacked -Wredundant-decls -Wundef -Wno-shadow -Wno-missing-field-initializers -Wno-missing-braces -Wno-sign-compare -Wno-multichar"
+          g++ $warnings -c -Ilib -Iexternals/tinyxml2 democlient/democlient.cpp
+
   selfcheck:
     needs: build # wait for all tests to be successful first
 
diff --git a/democlient/democlient.cpp b/democlient/democlient.cpp
index 994c12a78..c904ff787 100644
--- a/democlient/democlient.cpp
+++ b/democlient/democlient.cpp
@@ -1,3 +1,21 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2023 Cppcheck team.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 #include <ctime>
 #include <cstdio>
 #include <cstdlib>
@@ -44,7 +62,7 @@ public:
         cppcheck.check("test.cpp", code);
     }
 
-    void reportOut(const std::string &outmsg, Color c) override {}
+    void reportOut(const std::string & /*outmsg*/, Color /*c*/) override {}
     void reportErr(const ErrorMessage &msg) override {
         const std::string s = msg.toString(true);
 
@@ -54,9 +72,9 @@ public:
             std::fprintf(logfile, "%s\n", s.c_str());
     }
 
-    void reportProgress(const std::string& filename,
-                        const char stage[],
-                        const std::size_t value) override {
+    void reportProgress(const std::string& /*filename*/,
+                        const char /*stage*/[],
+                        const std::size_t /*value*/) override {
         if (std::time(nullptr) >= stoptime) {
             std::cout << "Time to analyse the code exceeded 2 seconds. Terminating.\n\n";
             Settings::terminate();