diff --git a/indra/newview/skins/default/xui/en/panel_preferences_graphics1.xml b/indra/newview/skins/default/xui/en/panel_preferences_graphics1.xml
index 2ea14aac30..9d4cd92403 100644
--- a/indra/newview/skins/default/xui/en/panel_preferences_graphics1.xml
+++ b/indra/newview/skins/default/xui/en/panel_preferences_graphics1.xml
@@ -1170,6 +1170,8 @@ If you do not understand the distinction then leave this control alone."
           increment="1"
           layout="topleft"
           left_pad="5"
+          max_val="3600"
+          min_val="0"
           name="TextureDiscardBackgroundedTime"
           tool_tip="Downscales textures after selected amount of seconds when not the active window."
           top_delta="-5"
@@ -1209,6 +1211,8 @@ If you do not understand the distinction then leave this control alone."
           increment="1"
           layout="topleft"
           left_pad="5"
+          max_val="3600"
+          min_val="0"
           name="TextureDiscardMinimizedTime"
           tool_tip="Downscales textures after selected amount of seconds when minimized."
           top_delta="-5"