diff --git a/autobuild.xml b/autobuild.xml
index 83fe052c56..0254355aa5 100644
--- a/autobuild.xml
+++ b/autobuild.xml
@@ -285,7 +285,7 @@
               <string>http://3p.firestormviewer.org/Tracy-v0.7.6-windows-210761143.tar.bz2</string>
             </map>
             <key>name</key>
-            <string>linux</string>
+            <string>windows</string>
           </map>
         </map>
         <key>version</key>
@@ -1944,9 +1944,9 @@
             <key>archive</key>
             <map>
               <key>hash</key>
-              <string>eba43dcfeb1c14aab25f588d9f625839</string>
+              <string>dce2cc624e216eb991412ec0c5538cf9</string>
               <key>url</key>
-              <string>file:///opt/firestorm/kdu-8.0.6-linux64-202302217.tar.bz2</string>
+              <string>file:///opt/firestorm/kdu-8.1-linux64-210652339.tar.bz2</string>
             </map>
             <key>name</key>
             <string>linux64</string>
diff --git a/indra/llkdu/llimagej2ckdu.h b/indra/llkdu/llimagej2ckdu.h
index d82189b5df..9de1159009 100644
--- a/indra/llkdu/llimagej2ckdu.h
+++ b/indra/llkdu/llimagej2ckdu.h
@@ -32,7 +32,7 @@
 //
 // KDU core header files
 //
-#ifndef LL_WINDOWS
+#ifdef LL_DARWIN
 #define KDU_NO_THREADS
 #endif
 
diff --git a/indra/llkdu/llkdumem.h b/indra/llkdu/llkdumem.h
index 44757a4bfc..28164e157e 100644
--- a/indra/llkdu/llkdumem.h
+++ b/indra/llkdu/llkdumem.h
@@ -28,7 +28,7 @@
 #define LL_LLKDUMEM_H
 
 // Support classes for reading and writing from memory buffers in KDU
-#ifndef LL_WINDOWS
+#ifdef LL_DARWIN
 #define KDU_NO_THREADS
 #endif