diff --git a/indra/newview/fsfloaterposer.cpp b/indra/newview/fsfloaterposer.cpp
index ecb178ccb0..b2d0aa79e0 100644
--- a/indra/newview/fsfloaterposer.cpp
+++ b/indra/newview/fsfloaterposer.cpp
@@ -24,6 +24,7 @@
  * $/LicenseInfo$
  */
 #include <string_view>
+#include <boost/algorithm/string.hpp>
 #include "fsfloaterposer.h"
 #include "fsposeranimator.h"
 #include "llagent.h"