diff --git a/lib/cppcheck.cpp b/lib/cppcheck.cpp
index 74c1c8d1c38d..9e0b1ea80c76 100644
--- a/lib/cppcheck.cpp
+++ b/lib/cppcheck.cpp
@@ -680,21 +680,27 @@ unsigned int CppCheck::checkFile(const FileWithDetails& file, const std::string
     try {
         if (mSettings.library.markupFile(file.spath())) {
             if (mUnusedFunctionsCheck && (mSettings.useSingleJob() || !mSettings.buildDir.empty())) {
+                std::size_t hash;
                 // this is not a real source file - we just want to tokenize it. treat it as C anyways as the language needs to be determined.
                 Tokenizer tokenizer(mSettings, *this);
                 // enforce the language since markup files are special and do not adhere to the enforced language
                 tokenizer.list.setLang(Standards::Language::C, true);
                 if (fileStream) {
-                    tokenizer.list.createTokens(*fileStream, file.spath());
+                    std::vector<std::string> files{file.spath()};
+                    simplecpp::TokenList tokens(*fileStream, files);
+                    const Preprocessor preprocessor(mSettings, *this);
+                    hash = calculateHash(preprocessor, tokens, mSettings);
+                    tokenizer.list.createTokens(std::move(tokens));
                 }
                 else {
-                    std::ifstream in(file.spath());
-                    tokenizer.list.createTokens(in, file.spath());
+                    std::vector<std::string> files{file.spath()};
+                    simplecpp::TokenList tokens(file.spath(), files);
+                    const Preprocessor preprocessor(mSettings, *this);
+                    hash = calculateHash(preprocessor, tokens, mSettings);
+                    tokenizer.list.createTokens(std::move(tokens));
                 }
                 mUnusedFunctionsCheck->parseTokens(tokenizer, mSettings);
 
-                // TODO: how to get the proper tokenlist to generate the proper hash?
-                const std::size_t hash = time(nullptr); // calculateHash(tokenizer.list, mSettings);
                 std::list<ErrorMessage> errors;
                 mAnalyzerInformation.analyzeFile(mSettings.buildDir, file.spath(), cfgname, hash, errors);
                 mAnalyzerInformation.setFileInfo("CheckUnusedFunctions", mUnusedFunctionsCheck->analyzerInfo());