diff --git a/indra/newview/skins/default/xui/en/panel_settings_sky_atmos.xml b/indra/newview/skins/default/xui/en/panel_settings_sky_atmos.xml
index fd0b3f88a8..4d0927552b 100644
--- a/indra/newview/skins/default/xui/en/panel_settings_sky_atmos.xml
+++ b/indra/newview/skins/default/xui/en/panel_settings_sky_atmos.xml
@@ -320,7 +320,7 @@
                             left="5"
                             top_pad="12"
                             width="105"
-                            tooltip="Irradiance control.  When not zero, enables HDR lighting model."
+                            tool_tip="Irradiance control.  When not zero, enables HDR lighting model."
                             wrap="true">
                     Reflection Probe Ambiance (HDR):
                   </text>