diff --git a/include/fmtlog/fmtlog-inl.h b/include/fmtlog/fmtlog-inl.h
index 16eed0d..c247f4c 100644
--- a/include/fmtlog/fmtlog-inl.h
+++ b/include/fmtlog/fmtlog-inl.h
@@ -103,10 +103,10 @@ class fmtlogDetailT
     setHeaderPattern("{HMSf} {s:<16} {l}[{t:<6}] ");
     logInfos.reserve(32);
     bgLogInfos.reserve(128);
-    bgLogInfos.emplace_back(nullptr, nullptr, fmtlog::DBG, fmt::string_view());
-    bgLogInfos.emplace_back(nullptr, nullptr, fmtlog::INF, fmt::string_view());
-    bgLogInfos.emplace_back(nullptr, nullptr, fmtlog::WRN, fmt::string_view());
-    bgLogInfos.emplace_back(nullptr, nullptr, fmtlog::ERR, fmt::string_view());
+    bgLogInfos.emplace_back(nullptr, nullptr, fmtlog::DBG, std::string{});
+    bgLogInfos.emplace_back(nullptr, nullptr, fmtlog::INF, std::string{});
+    bgLogInfos.emplace_back(nullptr, nullptr, fmtlog::WRN, std::string{});
+    bgLogInfos.emplace_back(nullptr, nullptr, fmtlog::ERR, std::string{});
     threadBuffers.reserve(8);
     bgThreadBuffers.reserve(8);
     memset(membuf.data(), 0, membuf.capacity());
@@ -118,8 +118,8 @@ class fmtlogDetailT
     closeLogFile();
   }
 
-  void setHeaderPattern(const char* pattern) {
-    if (shouldDeallocateHeader) delete[] headerPattern.data();
+  void setHeaderPattern(std::string pattern) {
+    // if (shouldDeallocateHeader) delete[] headerPattern.data();
     using namespace fmt::literals;
     for (int i = 0; i < parttenArgSize; i++) {
       reorderIdx[i] = parttenArgSize - 1;
@@ -130,7 +130,7 @@ class fmtlogDetailT
       "l"_a = fmtlog::LogLevel(), "s"_a = "fmtlog.cc:123", "g"_a = "/home/raomeng/fmtlog/fmtlog.cc:123", "Ymd"_a = "",
       "HMS"_a = "", "HMSe"_a = "", "HMSf"_a = "", "HMSF"_a = "", "YmdHMS"_a = "", "YmdHMSe"_a = "", "YmdHMSf"_a = "",
       "YmdHMSF"_a = "");
-    shouldDeallocateHeader = headerPattern.data() != pattern;
+    // shouldDeallocateHeader = headerPattern.data() != pattern;
 
     setArg<0>(fmt::string_view(weekdayName.s, 3));
     setArg<1>(fmt::string_view(monthName.s, 3));
@@ -177,7 +177,7 @@ class fmtlogDetailT
   struct StaticLogInfo
   {
     // Constructor
-    constexpr StaticLogInfo(fmtlog::FormatToFn fn, const char* loc, fmtlog::LogLevel level, fmt::string_view fmtString)
+    StaticLogInfo(fmtlog::FormatToFn fn, const char* loc, fmtlog::LogLevel level, std::string fmtString)
       : formatToFn(fn)
       , formatString(fmtString)
       , location(loc)
@@ -207,7 +207,7 @@ class fmtlogDetailT
     inline fmt::string_view getLocation() { return fmt::string_view(location, endPos); }
 
     fmtlog::FormatToFn formatToFn;
-    fmt::string_view formatString;
+    std::string formatString;
     const char* location;
     uint8_t basePos;
     uint8_t endPos;
@@ -217,7 +217,7 @@ class fmtlogDetailT
 
   static thread_local ThreadBufferDestroyer sbc;
   int64_t midnightNs;
-  fmt::string_view headerPattern;
+  std::string headerPattern;
   bool shouldDeallocateHeader = false;
   FILE* outputFp = nullptr;
   bool manageFp = false;
@@ -494,7 +494,7 @@ fmtlogDetailT<> fmtlogDetailWrapper<_>::impl;
 
 template<int _>
 void fmtlogT<_>::registerLogInfo(uint32_t& logId, FormatToFn fn, const char* location,
-                                 LogLevel level, fmt::string_view fmtString) noexcept {
+                                 LogLevel level, std::string fmtString) noexcept {
   auto& d = fmtlogDetailWrapper<>::impl;
   std::lock_guard<std::mutex> lock(d.logInfoMutex);
   if (logId) return;
diff --git a/include/fmtlog/fmtlog.h b/include/fmtlog/fmtlog.h
index 19e7bf5..6247188 100644
--- a/include/fmtlog/fmtlog.h
+++ b/include/fmtlog/fmtlog.h
@@ -379,7 +379,7 @@ class fmtlogT
                                     int& argIdx, std::vector<fmt::basic_format_arg<Context>>& args);
 
   static void registerLogInfo(uint32_t& logId, FormatToFn fn, const char* location, LogLevel level,
-                              fmt::string_view fmtString) noexcept;
+                              std::string fmtString) noexcept;
 
   static void vformat_to(MemoryBuffer& out, fmt::string_view fmt, fmt::format_args args);
 
@@ -610,11 +610,11 @@ class fmtlogT
   }
 
   template<bool Reorder, typename... Args>
-  static std::string unNameFormat(fmt::string_view in, uint32_t* reorderIdx,
+  static std::string unNameFormat(std::string in, uint32_t* reorderIdx,
                                        const Args&... args) {
     constexpr size_t num_named_args = fmt::detail::count<isNamedArg<Args>()...>();
     if constexpr (num_named_args == 0) {
-      return std::string{in.begin(),in.end()};
+      return in;
     }
     const char* begin = in.data();
     const char* p = begin;
@@ -679,7 +679,8 @@ class fmtlogT
     fmt::format_string<typename fmtlogdetail::UnrefPtr<fmt::remove_cvref_t<Args>>::type...> format,
     Args&&... args) noexcept {
     if (!logId) {
-      auto unnamed_format = unNameFormat<false>(fmt::string_view(format), nullptr, args...);
+      fmt::string_view format_str_v = format.get();
+      auto unnamed_format = unNameFormat<false>(std::string{format_str_v.begin(),format_str_v.end()}, nullptr, args...);
       registerLogInfo(logId, formatTo<Args...>, location, level, unnamed_format);
     }
     constexpr size_t num_cstring = fmt::detail::count<isCstring<Args>()...>();
diff --git a/test/src/enc_dec_test.cc b/test/src/enc_dec_test.cc
index 79ed2ac..e7a752f 100644
--- a/test/src/enc_dec_test.cc
+++ b/test/src/enc_dec_test.cc
@@ -56,7 +56,7 @@ void test(const S& format, Args&&... args) {
   string ans = fmt::format(fmt::runtime(sv), std::forward<Args>(args)...);
   assert(ans.size() == formatted_size);
 
-  auto unnamed_format = fmtlog::unNameFormat<false>(sv, nullptr, args...);
+  auto unnamed_format = fmtlog::unNameFormat<false>(format, nullptr, args...);
   fmt::print("unnamed_format: {}\n", unnamed_format);
   size_t cstringSizes[1000];
   char buf[1024];