diff --git a/indra/llcommon/llsd.cpp b/indra/llcommon/llsd.cpp
index 08cb7bd2a847ddc20b348533a738059cc11433eb..151eb4084a853f0119ccc00ce8fb3f489f2e0ab6 100644
--- a/indra/llcommon/llsd.cpp
+++ b/indra/llcommon/llsd.cpp
@@ -24,6 +24,9 @@
  * $/LicenseInfo$
  */
 
+// Must turn on conditional declarations in header file so definitions end up
+// with proper linkage.
+#define LLSD_DEBUG_INFO
 #include "linden_common.h"
 #include "llsd.h"