diff --git a/src/Common/OptimizedRegularExpression.h b/src/Common/OptimizedRegularExpression.h
index a3d38f27c07..bbb1b0d5eda 100644
--- a/src/Common/OptimizedRegularExpression.h
+++ b/src/Common/OptimizedRegularExpression.h
@@ -86,8 +86,6 @@ public:
     /// Get the regexp re2 or nullptr if the pattern is trivial (for output to the log).
     const std::unique_ptr<RegexType> & getRE2() const { return re2; }
 
-    static void analyze(const std::string & regexp_, std::string & required_substring, bool & is_trivial, bool & required_substring_is_prefix);
-
     void getAnalyzeResult(std::string & out_required_substring, bool & out_is_trivial, bool & out_required_substring_is_prefix) const
     {
         out_required_substring = required_substring;
@@ -104,6 +102,8 @@ private:
     std::optional<DB::StringSearcher<false, true>> case_insensitive_substring_searcher;
     std::unique_ptr<RegexType> re2;
     unsigned number_of_subpatterns;
+
+    static void analyze(const std::string & regexp_, std::string & required_substring, bool & is_trivial, bool & required_substring_is_prefix);
 };
 
 using OptimizedRegularExpression = OptimizedRegularExpressionImpl<true>;