diff --git a/gui/devices/240x240/res/ui.xml b/gui/devices/240x240/res/ui.xml
index 7448ae5..f1cd461 100644
--- a/gui/devices/240x240/res/ui.xml
+++ b/gui/devices/240x240/res/ui.xml
@@ -273,7 +273,7 @@
 
 			<object type="action">
 				<touch key="power" />
-				<action function="overlay">lock</action>
+				<action function="key">back</action>
 			</object>
 
 			<object type="action">
diff --git a/gui/devices/280x280/res/ui.xml b/gui/devices/280x280/res/ui.xml
index ae8c27d..24e6e4c 100644
--- a/gui/devices/280x280/res/ui.xml
+++ b/gui/devices/280x280/res/ui.xml
@@ -273,7 +273,7 @@
 
 			<object type="action">
 				<touch key="power" />
-				<action function="overlay">lock</action>
+				<action function="key">back</action>
 			</object>
 
 			<object type="action">
diff --git a/gui/devices/320x320/res/ui.xml b/gui/devices/320x320/res/ui.xml
index 4a03855..6558d0b 100644
--- a/gui/devices/320x320/res/ui.xml
+++ b/gui/devices/320x320/res/ui.xml
@@ -273,7 +273,7 @@
 
 			<object type="action">
 				<touch key="power" />
-				<action function="overlay">lock</action>
+				<action function="key">back</action>
 			</object>
 
 			<object type="action">