diff --git a/include/LogVisor/LogVisor.hpp b/include/LogVisor/LogVisor.hpp
index 68d5694..e63855b 100644
--- a/include/LogVisor/LogVisor.hpp
+++ b/include/LogVisor/LogVisor.hpp
@@ -146,7 +146,12 @@ public:
     inline void report(Level severity, const CharType* format, va_list ap)
     {
         for (auto& logger : MainLoggers)
-            logger->report(m_modName, severity, format, ap);
+        {
+            va_list apc;
+            va_copy(apc, ap);
+            logger->report(m_modName, severity, format, apc);
+            va_end(apc);
+        }
         if (severity == Error || severity == FatalError)
             LogVisorBp();
         if (severity == FatalError)
@@ -175,7 +180,13 @@ public:
     inline void reportSource(Level severity, const char* file, unsigned linenum, const CharType* format, va_list ap)
     {
         for (auto& logger : MainLoggers)
-            logger->reportSource(m_modName, severity, file, linenum, format, ap);
+        {
+            va_list apc;
+            va_copy(apc, ap);
+            logger->reportSource(m_modName, severity, file, linenum, format, apc);
+            va_end(apc);
+        }
+
         if (severity == FatalError)
             abort();
         else if (severity == Error)
diff --git a/lib/LogVisor.cpp b/lib/LogVisor.cpp
index 2d9eb5b..3c28212 100644
--- a/lib/LogVisor.cpp
+++ b/lib/LogVisor.cpp
@@ -332,6 +332,10 @@ struct FileLogger : public ILogger
             thrName = ThreadMap[thrId];
 
         fprintf(fp, "[");
+        fprintf(fp, "%5.4f ", tmd);
+        uint_fast64_t fIdx = FrameIndex.load();
+        if (fIdx)
+            fprintf(fp, "(%" PRIu64 ") ", fIdx);
         switch (severity)
         {
         case Info:
@@ -351,13 +355,9 @@ struct FileLogger : public ILogger
         };
         fprintf(fp, " %s", modName);
         if (sourceInfo)
-            fprintf(stderr, " {%s}", sourceInfo);
+            fprintf(fp, " {%s}", sourceInfo);
         if (thrName)
             fprintf(fp, " (%s)", thrName);
-        fprintf(fp, " %5.4f", tmd);
-        uint_fast64_t fIdx = FrameIndex.load();
-        if (fIdx)
-            fprintf(fp, " (%" PRIu64 ")", fIdx);
         fprintf(fp, "] ");
     }