diff --git a/indra/llcommon/llerror.cpp b/indra/llcommon/llerror.cpp
index 99b7f811a4..12980da896 100644
--- a/indra/llcommon/llerror.cpp
+++ b/indra/llcommon/llerror.cpp
@@ -55,6 +55,7 @@
 #include "llsingleton.h"
 #include "llstl.h"
 #include "lltimer.h"
+#include <boost/fiber/recursive_mutex.hpp>
 
 // On Mac, got:
 // #error "Boost.Stacktrace requires `_Unwind_Backtrace` function. Define
@@ -511,7 +512,7 @@ namespace
         LLError::TimeFunction               mTimeFunction;
 
         Recorders                           mRecorders;
-        LLCoros::Mutex                      mRecorderMutex;
+        boost::fibers::recursive_mutex      mRecorderMutex;
 
         int                                 mShouldLogCallCounter;
 
@@ -1055,7 +1056,7 @@ namespace LLError
             return;
         }
         SettingsConfigPtr s = Globals::getInstance()->getSettingsConfig();
-        LLCoros::LockType lock(s->mRecorderMutex);
+        std::unique_lock lock(s->mRecorderMutex);
         s->mRecorders.push_back(recorder);
     }
 
@@ -1066,7 +1067,7 @@ namespace LLError
             return;
         }
         SettingsConfigPtr s = Globals::getInstance()->getSettingsConfig();
-        LLCoros::LockType lock(s->mRecorderMutex);
+        std::unique_lock lock(s->mRecorderMutex);
         s->mRecorders.erase(std::remove(s->mRecorders.begin(), s->mRecorders.end(), recorder),
                             s->mRecorders.end());
     }
@@ -1115,7 +1116,7 @@ namespace LLError
     std::shared_ptr<RECORDER> findRecorder()
     {
         SettingsConfigPtr s = Globals::getInstance()->getSettingsConfig();
-        LLCoros::LockType lock(s->mRecorderMutex);
+        std::unique_lock lock(s->mRecorderMutex);
         return findRecorderPos<RECORDER>(s).first;
     }
 
@@ -1126,7 +1127,7 @@ namespace LLError
     bool removeRecorder()
     {
         SettingsConfigPtr s = Globals::getInstance()->getSettingsConfig();
-        LLCoros::LockType lock(s->mRecorderMutex);
+        std::unique_lock lock(s->mRecorderMutex);
         auto found = findRecorderPos<RECORDER>(s);
         if (found.first)
         {
@@ -1232,7 +1233,7 @@ namespace
 
         std::string escaped_message;
 
-        LLCoros::LockType lock(s->mRecorderMutex);
+        std::unique_lock lock(s->mRecorderMutex);
         for (LLError::RecorderPtr& r : s->mRecorders)
         {
             // <FS:Ansariel> Crash fix