diff --git a/bin/OpenSim.exe.config b/bin/OpenSim.exe.config
index e19a47a4a4..b01191e140 100755
--- a/bin/OpenSim.exe.config
+++ b/bin/OpenSim.exe.config
@@ -39,7 +39,7 @@
         <acceptOnMatch value="false"/>
       </filter>
       <layout type="log4net.Layout.PatternLayout">
-        <conversionPattern value="%date %-5level - %logger %message%newline" />
+        <conversionPattern value="%date %-5level (%thread) - %logger %message%newline" />
       </layout>
     </appender>
 
diff --git a/bin/Robust.exe.config b/bin/Robust.exe.config
index 3a978b20d4..7db6458d26 100644
--- a/bin/Robust.exe.config
+++ b/bin/Robust.exe.config
@@ -37,7 +37,7 @@
         <acceptOnMatch value="false"/>
       </filter>
       <layout type="log4net.Layout.PatternLayout">
-        <conversionPattern value="%date %-5level - %logger %message%newline" />
+        <conversionPattern value="%date %-5level (%thread) - %logger %message%newline" />
       </layout>
     </appender>