diff --git a/indra/llkdu/CMakeLists.txt b/indra/llkdu/CMakeLists.txt
index b8f8b420c329cc8bc0c448c900f4d3ca34bfed41..cb0e204e91a6f2eb26c839727cd6b8d20e08380d 100755
--- a/indra/llkdu/CMakeLists.txt
+++ b/indra/llkdu/CMakeLists.txt
@@ -40,6 +40,14 @@ set_source_files_properties(${llkdu_HEADER_FILES}
 
 list(APPEND llkdu_SOURCE_FILES ${llkdu_HEADER_FILES})
 
+# Our KDU package is built with KDU_X86_INTRINSICS in its .vcxproj file.
+# Unless that macro is also set for every consumer build, KDU freaks out,
+# spamming the viewer log with alignment FUD.
+set_source_files_properties(${llkdu_SOURCE_FILES}
+                            PROPERTIES
+                            COMPILE_DEFINITIONS
+                            "KDU_X86_INTRINSICS")
+
 if (USE_KDU)
   add_library (llkdu ${llkdu_SOURCE_FILES})