diff --git a/indra/newview/llpanelenvironment.h b/indra/newview/llpanelenvironment.h
index 8942e20119..c9b95cc348 100644
--- a/indra/newview/llpanelenvironment.h
+++ b/indra/newview/llpanelenvironment.h
@@ -40,6 +40,7 @@
 
 class LLViewerRegion;
 class LLIconCtrl;
+class LLSettingsDropTarget;
 
 class LLPanelEnvironmentInfo : public LLPanel
 {