diff --git a/indra/llkdu/llkdumem.h b/indra/llkdu/llkdumem.h
index b2c95acccc..5ab0916775 100755
--- a/indra/llkdu/llkdumem.h
+++ b/indra/llkdu/llkdumem.h
@@ -38,7 +38,7 @@
 // </FS:ND>
 
 // Support classes for reading and writing from memory buffers in KDU
-#define KDU_NO_THREAD
+#define KDU_NO_THREADS
 
 // <FS:ND> Some magic to make KDU and the viewer agree with internal alignments
 #if KDU_MAJOR_VERSION >= 7 && KDU_MINOR_VERSION >= 5